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<meta http-equiv="content-type" content="text/html; charset=UTF-8"><title>5&nbsp;Advanced Student</title><link rel="stylesheet" type="text/css" href="advanced_files/scribble.css" title="default"><link rel="stylesheet" type="text/css" href="advanced_files/racket.css" title="default"><link rel="stylesheet" type="text/css" href="advanced_files/scribble-style.css" title="default"><script type="text/javascript" src="advanced_files/scribble-common.js"></script></head><body id="doc-racket-lang-org"><div class="tocset"><div class="tocview"><div class="tocviewlist" style="margin-bottom: 1em;"><div class="tocviewtitle"><table cellpadding="0" cellspacing="0"><tbody><tr><td style="width: 1em;"><a href="javascript:void(0);" title="Expand/Collapse" class="tocviewtoggle" onclick='TocviewToggle(this,"tocview_0");'>笆ｺ</a></td><td></td><td><a href="http://docs.racket-lang.org/htdp-langs/index.html" class="tocviewlink" pltdoc="x"><span style="font-style: italic;">How to Design Programs</span> Languages</a></td></tr></tbody></table></div><div class="tocviewsublisttop" style="display: none;" id="tocview_0"><table cellpadding="0" cellspacing="0"><tbody><tr><td align="right">1&nbsp;</td><td><a href="http://docs.racket-lang.org/htdp-langs/beginner.html" class="tocviewlink" pltdoc="x">Beginning Student</a></td></tr><tr><td align="right">2&nbsp;</td><td><a href="http://docs.racket-lang.org/htdp-langs/beginner-abbr.html" class="tocviewlink" pltdoc="x">Beginning Student with List Abbreviations</a></td></tr><tr><td align="right">3&nbsp;</td><td><a href="http://docs.racket-lang.org/htdp-langs/intermediate.html" class="tocviewlink" pltdoc="x">Intermediate Student</a></td></tr><tr><td align="right">4&nbsp;</td><td><a href="http://docs.racket-lang.org/htdp-langs/intermediate-lam.html" class="tocviewlink" pltdoc="x">Intermediate Student with Lambda</a></td></tr><tr><td align="right">5&nbsp;</td><td><a href="" class="tocviewselflink" pltdoc="x">Advanced Student</a></td></tr><tr><td align="right"></td><td><a href="http://docs.racket-lang.org/htdp-langs/doc-index.html" class="tocviewlink" pltdoc="x">Index</a></td></tr></tbody></table></div></div><div class="tocviewlist"><table cellpadding="0" cellspacing="0"><tbody><tr><td style="width: 1em;"><a href="javascript:void(0);" title="Expand/Collapse" class="tocviewtoggle" onclick='TocviewToggle(this,"tocview_1");'>▼</a></td><td>5&nbsp;</td><td><a href="" class="tocviewselflink" pltdoc="x">Advanced Student</a></td></tr></tbody></table><div class="tocviewsublistbottom" style="display: block;" id="tocview_1"><table cellpadding="0" cellspacing="0"><tbody><tr><td align="right">5.1&nbsp;</td><td><a href="http://docs.racket-lang.org/htdp-langs/advanced-define.html" class="tocviewlink" pltdoc="x"><span class="RktSym"><span class="RktStxLink">define</span></span></a></td></tr><tr><td align="right">5.2&nbsp;</td><td><a href="http://docs.racket-lang.org/htdp-langs/advanced-define-struct.html" class="tocviewlink" pltdoc="x"><span class="RktSym"><span class="RktStxLink">define-<wbr>struct</span></span></a></td></tr><tr><td align="right">5.3&nbsp;</td><td><a href="http://docs.racket-lang.org/htdp-langs/advanced-lambda.html" class="tocviewlink" pltdoc="x"><span class="RktSym"><span class="RktStxLink">lambda</span></span></a></td></tr><tr><td align="right">5.4&nbsp;</td><td><a href="http://docs.racket-lang.org/htdp-langs/advanced-call.html" class="tocviewlink" pltdoc="x">Function Calls</a></td></tr><tr><td align="right">5.5&nbsp;</td><td><a href="http://docs.racket-lang.org/htdp-langs/begin.html" class="tocviewlink" pltdoc="x"><span class="RktSym"><span class="RktStxLink">begin</span></span></a></td></tr><tr><td align="right">5.6&nbsp;</td><td><a href="http://docs.racket-lang.org/htdp-langs/begin0.html" class="tocviewlink" pltdoc="x"><span class="RktSym"><span class="RktStxLink">begin0</span></span></a></td></tr><tr><td align="right">5.7&nbsp;</td><td><a href="http://docs.racket-lang.org/htdp-langs/set_.html" class="tocviewlink" pltdoc="x"><span class="RktSym"><span class="RktStxLink">set!</span></span></a></td></tr><tr><td align="right">5.8&nbsp;</td><td><a href="http://docs.racket-lang.org/htdp-langs/delay.html" class="tocviewlink" pltdoc="x"><span class="RktSym"><span class="RktStxLink">delay</span></span></a></td></tr><tr><td align="right">5.9&nbsp;</td><td><a href="http://docs.racket-lang.org/htdp-langs/shared.html" class="tocviewlink" pltdoc="x"><span class="RktSym"><span class="RktStxLink">shared</span></span></a></td></tr><tr><td align="right">5.10&nbsp;</td><td><a href="http://docs.racket-lang.org/htdp-langs/advanced-let.html" class="tocviewlink" pltdoc="x"><span class="RktSym"><span class="RktStxLink">let</span></span></a></td></tr><tr><td align="right">5.11&nbsp;</td><td><a href="http://docs.racket-lang.org/htdp-langs/recur.html" class="tocviewlink" pltdoc="x"><span class="RktSym"><span class="RktStxLink">recur</span></span></a></td></tr><tr><td align="right">5.12&nbsp;</td><td><a href="http://docs.racket-lang.org/htdp-langs/case.html" class="tocviewlink" pltdoc="x"><span class="RktSym"><span class="RktStxLink">case</span></span></a></td></tr><tr><td align="right">5.13&nbsp;</td><td><a href="http://docs.racket-lang.org/htdp-langs/when_and_unless.html" class="tocviewlink" pltdoc="x"><span class="RktSym"><span class="RktStxLink">when</span></span> and <span class="RktSym"><span class="RktStxLink">unless</span></span></a></td></tr><tr><td align="right">5.14&nbsp;</td><td><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html" class="tocviewlink" pltdoc="x">Primitive Operations</a></td></tr><tr><td align="right">5.15&nbsp;</td><td><a href="http://docs.racket-lang.org/htdp-langs/advanced-unchanged.html" class="tocviewlink" pltdoc="x">Unchanged Forms</a></td></tr></tbody></table></div></div></div></div><div class="maincolumn"><div class="main"><div class="navsettop"><span class="navleft"><form class="searchform"><input class="searchbox" style="color: rgb(136, 136, 136);" value="...search manuals..." title="Enter a search string to search the manuals" onkeypress='return DoSearchKey(event, this, "5.0.1", "../");' onfocus='this.style.color="black"; this.style.textAlign="left"; if (this.value == "...search manuals...") this.value="";' onblur='if (this.value.match(/^ *$/)) { this.style.color="#888"; this.style.textAlign="center"; this.value="...search manuals..."; }' type="text"></form>&nbsp;&nbsp;<a href="http://docs.racket-lang.org/index.html" title="up to the documentation top" pltdoc="x" onclick='return GotoPLTRoot("5.0.1");'>top</a></span><span class="navright"><a href="http://docs.racket-lang.org/htdp-langs/intermediate-lambda-unchanged.html" title="backward to &quot;4.5 Unchanged Forms&quot;" pltdoc="x">← prev</a>&nbsp;&nbsp;<a href="http://docs.racket-lang.org/htdp-langs/index.html" title="up to &quot;How to Design Programs Languages&quot;" pltdoc="x">up</a>&nbsp;&nbsp;<a href="http://docs.racket-lang.org/htdp-langs/advanced-define.html" title="forward to &quot;5.1 define&quot;" pltdoc="x">next →</a></span>&nbsp;</div><h3>5<tt>&nbsp;</tt><a name="(part._advanced)"></a>Advanced Student</h3><p><table cellspacing="0"><tbody><tr><td valign="baseline" align="right"><span class="hspace">&nbsp;&nbsp;</span><span class="RktVar">program</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">=</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktVar">def-or-expr</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td></tr><tr><td valign="baseline" align="right"><span class="hspace">&nbsp;&nbsp;</span><span class="RktVar">def-or-expr</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">=</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktVar">definition</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktVar">expr</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktVar">test-case</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktVar">library-require</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td></tr><tr><td valign="baseline" align="right"><span class="hspace">&nbsp;&nbsp;</span><span class="RktVar">definition</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">=</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktPn">(</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-define.html#%28form._%28%28lib._lang/htdp-advanced..rkt%29._define%29%29" class="RktStxLink" pltdoc="x">define</a></span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktVar">id</span><span class="hspace">&nbsp;</span><span class="RktVar">id</span><span class="hspace">&nbsp;</span><span class="RktVar">id</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktVar">expr</span><span class="RktPn">)</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktPn">(</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-define.html#%28form._%28%28lib._lang/htdp-advanced..rkt%29._define%29%29" class="RktStxLink" pltdoc="x">define</a></span><span class="hspace">&nbsp;</span><span class="RktVar">id</span><span class="hspace">&nbsp;</span><span class="RktVar">expr</span><span class="RktPn">)</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktPn">(</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-define-struct.html#%28form._%28%28lib._lang/htdp-advanced..rkt%29._define-struct%29%29" class="RktStxLink" pltdoc="x">define-struct</a></span><span class="hspace">&nbsp;</span><span class="RktVar">id</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktVar">id</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td></tr><tr><td valign="baseline" align="right"><span class="hspace">&nbsp;&nbsp;</span><span class="RktVar">expr</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">=</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktPn">(</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/begin.html#%28form._%28%28lib._lang/htdp-advanced..rkt%29._begin%29%29" class="RktStxLink" pltdoc="x">begin</a></span><span class="hspace">&nbsp;</span><span class="RktVar">expr</span><span class="hspace">&nbsp;</span><span class="RktVar">expr</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="RktPn">)</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktPn">(</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/begin0.html#%28form._%28%28lib._lang/htdp-advanced..rkt%29._begin0%29%29" class="RktStxLink" pltdoc="x">begin0</a></span><span class="hspace">&nbsp;</span><span class="RktVar">expr</span><span class="hspace">&nbsp;</span><span class="RktVar">expr</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="RktPn">)</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktPn">(</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/set_.html#%28form._%28%28lib._lang/htdp-advanced..rkt%29._set%21%29%29" class="RktStxLink" pltdoc="x">set!</a></span><span class="hspace">&nbsp;</span><span class="RktVar">id</span><span class="hspace">&nbsp;</span><span class="RktVar">expr</span><span class="RktPn">)</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktPn">(</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/delay.html#%28form._%28%28lib._lang/htdp-advanced..rkt%29._delay%29%29" class="RktStxLink" pltdoc="x">delay</a></span><span class="hspace">&nbsp;</span><span class="RktVar">expr</span><span class="RktPn">)</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktPn">(</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-lambda.html#%28form._%28%28lib._lang/htdp-advanced..rkt%29._lambda%29%29" class="RktStxLink" pltdoc="x">lambda</a></span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktVar">id</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktVar">expr</span><span class="RktPn">)</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktPn">(</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-lambda.html#%28form._%28%28lib._lang/htdp-advanced..rkt%29._%7Ece%7Ebb%29%29" class="RktStxLink" pltdoc="x">λ</a></span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktVar">id</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktVar">expr</span><span class="RktPn">)</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktPn">(</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-unchanged.html#%28form._%28%28lib._lang/htdp-advanced..rkt%29._local%29%29" class="RktStxLink" pltdoc="x">local</a></span><span class="hspace">&nbsp;</span><span class="RktPn">[</span><span class="RktVar">definition</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="RktPn">]</span><span class="hspace">&nbsp;</span><span class="RktVar">expr</span><span class="RktPn">)</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktPn">(</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-unchanged.html#%28form._%28%28lib._lang/htdp-advanced..rkt%29._letrec%29%29" class="RktStxLink" pltdoc="x">letrec</a></span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktPn">[</span><span class="RktVar">id</span><span class="hspace">&nbsp;</span><span class="RktVar">expr</span><span class="RktPn">]</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktVar">expr</span><span class="RktPn">)</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktPn">(</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/shared.html#%28form._%28%28lib._lang/htdp-advanced..rkt%29._shared%29%29" class="RktStxLink" pltdoc="x">shared</a></span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktPn">[</span><span class="RktVar">id</span><span class="hspace">&nbsp;</span><span class="RktVar">expr</span><span class="RktPn">]</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktVar">expr</span><span class="RktPn">)</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktPn">(</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-let.html#%28form._%28%28lib._lang/htdp-advanced..rkt%29._let%29%29" class="RktStxLink" pltdoc="x">let</a></span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktPn">[</span><span class="RktVar">id</span><span class="hspace">&nbsp;</span><span class="RktVar">expr</span><span class="RktPn">]</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktVar">expr</span><span class="RktPn">)</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktPn">(</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-let.html#%28form._%28%28lib._lang/htdp-advanced..rkt%29._let%29%29" class="RktStxLink" pltdoc="x">let</a></span><span class="hspace">&nbsp;</span><span class="RktVar">id</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktPn">[</span><span class="RktVar">id</span><span class="hspace">&nbsp;</span><span class="RktVar">expr</span><span class="RktPn">]</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktVar">expr</span><span class="RktPn">)</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktPn">(</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-unchanged.html#%28form._%28%28lib._lang/htdp-advanced..rkt%29._let*%29%29" class="RktStxLink" pltdoc="x">let*</a></span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktPn">[</span><span class="RktVar">id</span><span class="hspace">&nbsp;</span><span class="RktVar">expr</span><span class="RktPn">]</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktVar">expr</span><span class="RktPn">)</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktPn">(</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/recur.html#%28form._%28%28lib._lang/htdp-advanced..rkt%29._recur%29%29" class="RktStxLink" pltdoc="x">recur</a></span><span class="hspace">&nbsp;</span><span class="RktVar">id</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktPn">[</span><span class="RktVar">id</span><span class="hspace">&nbsp;</span><span class="RktVar">expr</span><span class="RktPn">]</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktVar">expr</span><span class="RktPn">)</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktPn">(</span><span class="RktVar">expr</span><span class="hspace">&nbsp;</span><span class="RktVar">expr</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktCmt">;</span><span class="RktCmt">&nbsp;</span><span class="RktCmt"><a href="http://docs.racket-lang.org/htdp-langs/advanced-call.html" pltdoc="x">function call</a></span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktPn">(</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-unchanged.html#%28form._%28%28lib._lang/htdp-advanced..rkt%29._cond%29%29" class="RktStxLink" pltdoc="x">cond</a></span><span class="hspace">&nbsp;</span><span class="RktPn">[</span><span class="RktVar">expr</span><span class="hspace">&nbsp;</span><span class="RktVar">expr</span><span class="RktPn">]</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktPn">[</span><span class="RktVar">expr</span><span class="hspace">&nbsp;</span><span class="RktVar">expr</span><span class="RktPn">]</span><span class="RktPn">)</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktPn">(</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-unchanged.html#%28form._%28%28lib._lang/htdp-advanced..rkt%29._cond%29%29" class="RktStxLink" pltdoc="x">cond</a></span><span class="hspace">&nbsp;</span><span class="RktPn">[</span><span class="RktVar">expr</span><span class="hspace">&nbsp;</span><span class="RktVar">expr</span><span class="RktPn">]</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktPn">[</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-unchanged.html#%28form._%28%28lib._lang/htdp-advanced..rkt%29._else%29%29" class="RktStxLink" pltdoc="x">else</a></span><span class="hspace">&nbsp;</span><span class="RktVar">expr</span><span class="RktPn">]</span><span class="RktPn">)</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><table class="RktBlk" cellspacing="0"><tbody><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/case.html#%28form._%28%28lib._lang/htdp-advanced..rkt%29._case%29%29" class="RktStxLink" pltdoc="x">case</a></span><span class="hspace">&nbsp;</span><span class="RktVar">expr</span><span class="hspace">&nbsp;</span><span class="RktPn">[</span><span class="RktPn">(</span><span class="RktVar">choice</span><span class="hspace">&nbsp;</span><span class="RktVar">choice</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktVar">expr</span><span class="RktPn">]</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span></td></tr><tr><td><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span class="RktPn">[</span><span class="RktPn">(</span><span class="RktVar">choice</span><span class="hspace">&nbsp;</span><span class="RktVar">choice</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktVar">expr</span><span class="RktPn">]</span><span class="RktPn">)</span></td></tr></tbody></table></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><table class="RktBlk" cellspacing="0"><tbody><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/case.html#%28form._%28%28lib._lang/htdp-advanced..rkt%29._case%29%29" class="RktStxLink" pltdoc="x">case</a></span><span class="hspace">&nbsp;</span><span class="RktVar">expr</span><span class="hspace">&nbsp;</span><span class="RktPn">[</span><span class="RktPn">(</span><span class="RktVar">choice</span><span class="hspace">&nbsp;</span><span class="RktVar">choice</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktVar">expr</span><span class="RktPn">]</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span></td></tr><tr><td><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span class="RktPn">[</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-unchanged.html#%28form._%28%28lib._lang/htdp-advanced..rkt%29._else%29%29" class="RktStxLink" pltdoc="x">else</a></span><span class="hspace">&nbsp;</span><span class="RktVar">expr</span><span class="RktPn">]</span><span class="RktPn">)</span></td></tr></tbody></table></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktPn">(</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-unchanged.html#%28form._%28%28lib._lang/htdp-advanced..rkt%29._if%29%29" class="RktStxLink" pltdoc="x">if</a></span><span class="hspace">&nbsp;</span><span class="RktVar">expr</span><span class="hspace">&nbsp;</span><span class="RktVar">expr</span><span class="hspace">&nbsp;</span><span class="RktVar">expr</span><span class="RktPn">)</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktPn">(</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/when_and_unless.html#%28form._%28%28lib._lang/htdp-advanced..rkt%29._when%29%29" class="RktStxLink" pltdoc="x">when</a></span><span class="hspace">&nbsp;</span><span class="RktVar">expr</span><span class="hspace">&nbsp;</span><span class="RktVar">expr</span><span class="RktPn">)</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktPn">(</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/when_and_unless.html#%28form._%28%28lib._lang/htdp-advanced..rkt%29._unless%29%29" class="RktStxLink" pltdoc="x">unless</a></span><span class="hspace">&nbsp;</span><span class="RktVar">expr</span><span class="hspace">&nbsp;</span><span class="RktVar">expr</span><span class="RktPn">)</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktPn">(</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-unchanged.html#%28form._%28%28lib._lang/htdp-advanced..rkt%29._and%29%29" class="RktStxLink" pltdoc="x">and</a></span><span class="hspace">&nbsp;</span><span class="RktVar">expr</span><span class="hspace">&nbsp;</span><span class="RktVar">expr</span><span class="hspace">&nbsp;</span><span class="RktVar">expr</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="RktPn">)</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktPn">(</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-unchanged.html#%28form._%28%28lib._lang/htdp-advanced..rkt%29._or%29%29" class="RktStxLink" pltdoc="x">or</a></span><span class="hspace">&nbsp;</span><span class="RktVar">expr</span><span class="hspace">&nbsp;</span><span class="RktVar">expr</span><span class="hspace">&nbsp;</span><span class="RktVar">expr</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="RktPn">)</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktPn">(</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-unchanged.html#%28form._%28%28lib._lang/htdp-advanced..rkt%29._time%29%29" class="RktStxLink" pltdoc="x">time</a></span><span class="hspace">&nbsp;</span><span class="RktVar">expr</span><span class="RktPn">)</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-unchanged.html#%28def._%28%28lib._lang/htdp-advanced..rkt%29._empty%29%29" class="RktValLink" pltdoc="x">empty</a></span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktVar">id</span><span class="hspace">&nbsp;</span><span class="RktCmt">;</span><span class="RktCmt">&nbsp;</span><span class="RktCmt"><a href="http://docs.racket-lang.org/htdp-langs/intermediate-id.html" pltdoc="x">identifier</a></span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktVar">prim-op</span><span class="hspace">&nbsp;</span><span class="RktCmt">;</span><span class="RktCmt">&nbsp;</span><span class="RktCmt"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html" pltdoc="x">primitive operation</a></span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktVal">’</span><span class="RktVar">quoted</span><span class="hspace">&nbsp;</span><span class="RktCmt">;</span><span class="RktCmt">&nbsp;</span><span class="RktCmt"><a href="http://docs.racket-lang.org/htdp-langs/beginner-abbr-quote.html" pltdoc="x">quoted value</a></span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktVal">`</span><span class="RktVar">quasiquoted</span><span class="hspace">&nbsp;</span><span class="RktCmt">;</span><span class="RktCmt">&nbsp;</span><span class="RktCmt"><a href="http://docs.racket-lang.org/htdp-langs/beginner-abbr-quasiquote.html" pltdoc="x">quasiquote</a></span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktVar">number</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-unchanged.html#%28def._%28%28lib._lang/htdp-advanced..rkt%29._true%29%29" class="RktValLink" pltdoc="x">true</a></span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-unchanged.html#%28def._%28%28lib._lang/htdp-advanced..rkt%29._false%29%29" class="RktValLink" pltdoc="x">false</a></span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktVar">string</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktVar">character</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td></tr><tr><td valign="baseline" align="right"><span class="hspace">&nbsp;&nbsp;</span><span class="RktVar">choice</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">=</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktVar">id</span><span class="hspace">&nbsp;</span><span class="RktCmt">;</span><span class="RktCmt">&nbsp;</span><span class="RktCmt">treated as a symbol</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktVar">number</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td></tr><tr><td valign="baseline" align="right"><span class="hspace">&nbsp;&nbsp;</span><span class="RktVar">quoted</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">=</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktVar">id</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktVar">number</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktVar">string</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktVar">character</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktPn">(</span><span class="RktVar">quoted</span><span class="stt"> </span><span class="RktSym">...</span><span class="RktPn">)</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktVal">’</span><span class="RktVar">quoted</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktVal">`</span><span class="RktVar">quoted</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">,</span><span class="RktVar">quoted</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">,@</span><span class="RktVar">quoted</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td></tr><tr><td valign="baseline" align="right"><span class="hspace">&nbsp;&nbsp;</span><span class="RktVar">quasiquoted</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">=</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktVar">id</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktVar">number</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktVar">string</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktVar">character</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktPn">(</span><span class="RktVar">quasiquoted</span><span class="stt"> </span><span class="RktSym">...</span><span class="RktPn">)</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktVal">’</span><span class="RktVar">quasiquoted</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktVal">`</span><span class="RktVar">quasiquoted</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">,</span><span class="RktSym">expr</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">,@</span><span class="RktSym">expr</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td></tr><tr><td valign="baseline" align="right"><span class="hspace">&nbsp;&nbsp;</span><span class="RktVar">test-case</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">=</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktPn">(</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-unchanged.html#%28form._%28%28lib._lang/htdp-advanced..rkt%29._check-expect%29%29" class="RktStxLink" pltdoc="x">check-expect</a></span><span class="stt"> </span><span class="RktSym">expr</span><span class="stt"> </span><span class="RktSym">expr</span><span class="RktPn">)</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktPn">(</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-unchanged.html#%28form._%28%28lib._lang/htdp-advanced..rkt%29._check-within%29%29" class="RktStxLink" pltdoc="x">check-within</a></span><span class="stt"> </span><span class="RktSym">expr</span><span class="stt"> </span><span class="RktSym">expr</span><span class="stt"> </span><span class="RktSym">expr</span><span class="RktPn">)</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktPn">(</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/Unchanged_Forms.html#%28form._%28%28lib._lang/htdp-beginner-abbr..rkt%29._check-member-of%29%29" class="RktStxLink" pltdoc="x">check-member-of</a></span><span class="stt"> </span><span class="RktSym">expr</span><span class="stt"> </span><span class="RktSym">expr</span><span class="stt"> </span><span class="RktSym">...</span><span class="RktPn">)</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktPn">(</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/Unchanged_Forms.html#%28form._%28%28lib._lang/htdp-beginner-abbr..rkt%29._check-range%29%29" class="RktStxLink" pltdoc="x">check-range</a></span><span class="stt"> </span><span class="RktSym">expr</span><span class="stt"> </span><span class="RktSym">expr</span><span class="stt"> </span><span class="RktSym">expr</span><span class="RktPn">)</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktPn">(</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-unchanged.html#%28form._%28%28lib._lang/htdp-advanced..rkt%29._check-error%29%29" class="RktStxLink" pltdoc="x">check-error</a></span><span class="stt"> </span><span class="RktSym">expr</span><span class="stt"> </span><span class="RktSym">expr</span><span class="RktPn">)</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td></tr><tr><td valign="baseline" align="right"><span class="hspace">&nbsp;&nbsp;</span><span class="RktVar">library-require</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">=</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktPn">(</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-unchanged.html#%28form._%28%28lib._lang/htdp-advanced..rkt%29._require%29%29" class="RktStxLink" pltdoc="x">require</a></span><span class="stt"> </span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/beginner-abbr-prim-ops.html#%28def._%28lib._htdp-beginner-abbr..ss._lang%29._%28%28lib._lang/htdp-beginner-abbr..rkt%29._string%29%29" class="RktValLink" pltdoc="x">string</a></span><span class="RktPn">)</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktPn">(</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-unchanged.html#%28form._%28%28lib._lang/htdp-advanced..rkt%29._require%29%29" class="RktStxLink" pltdoc="x">require</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym">lib</span><span class="stt"> </span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/beginner-abbr-prim-ops.html#%28def._%28lib._htdp-beginner-abbr..ss._lang%29._%28%28lib._lang/htdp-beginner-abbr..rkt%29._string%29%29" class="RktValLink" pltdoc="x">string</a></span><span class="stt"> </span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/beginner-abbr-prim-ops.html#%28def._%28lib._htdp-beginner-abbr..ss._lang%29._%28%28lib._lang/htdp-beginner-abbr..rkt%29._string%29%29" class="RktValLink" pltdoc="x">string</a></span><span class="stt"> </span><span class="RktSym">...</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">|</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktPn">(</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-unchanged.html#%28form._%28%28lib._lang/htdp-advanced..rkt%29._require%29%29" class="RktStxLink" pltdoc="x">require</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym">planet</span><span class="stt"> </span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/beginner-abbr-prim-ops.html#%28def._%28lib._htdp-beginner-abbr..ss._lang%29._%28%28lib._lang/htdp-beginner-abbr..rkt%29._string%29%29" class="RktValLink" pltdoc="x">string</a></span><span class="stt"> </span><span class="RktVar">package</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td valign="baseline" align="right"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td></tr><tr><td valign="baseline" align="right"><span class="hspace">&nbsp;&nbsp;</span><span class="RktVar">package</span></td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="center">=</td><td valign="baseline" align="left"><span class="stt">&nbsp;</span></td><td valign="baseline" align="left"><span class="RktPn">(</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/beginner-abbr-prim-ops.html#%28def._%28lib._htdp-beginner-abbr..ss._lang%29._%28%28lib._lang/htdp-beginner-abbr..rkt%29._string%29%29" class="RktValLink" pltdoc="x">string</a></span><span class="stt"> </span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/beginner-abbr-prim-ops.html#%28def._%28lib._htdp-beginner-abbr..ss._lang%29._%28%28lib._lang/htdp-beginner-abbr..rkt%29._string%29%29" class="RktValLink" pltdoc="x">string</a></span><span class="stt"> </span><span class="RktSym">number</span><span class="stt"> </span><span class="RktSym">number</span><span class="RktPn">)</span></td></tr></tbody></table></p><p></p><div class="SIntrapara">An <span class="RktVar">id</span> is a sequence of characters not including a
4 space or one of the following:</div><div class="SIntrapara"><span class="hspace">&nbsp;&nbsp;</span> <span class="RktInBG"><span class="hspace"></span><span class="RktIn">"</span><span class="hspace"></span></span> <span class="RktInBG"><span class="hspace"></span><span class="RktIn">,</span><span class="hspace"></span></span> <span class="RktInBG"><span class="hspace"></span><span class="RktIn">'</span><span class="hspace"></span></span> <span class="RktInBG"><span class="hspace"></span><span class="RktIn">`</span><span class="hspace"></span></span>
5 <span class="RktInBG"><span class="hspace"></span><span class="RktIn">(</span><span class="hspace"></span></span> <span class="RktInBG"><span class="hspace"></span><span class="RktIn">)</span><span class="hspace"></span></span> <span class="RktInBG"><span class="hspace"></span><span class="RktIn">[</span><span class="hspace"></span></span> <span class="RktInBG"><span class="hspace"></span><span class="RktIn">]</span><span class="hspace"></span></span>
6 <span class="RktInBG"><span class="hspace"></span><span class="RktIn">{</span><span class="hspace"></span></span> <span class="RktInBG"><span class="hspace"></span><span class="RktIn">}</span><span class="hspace"></span></span> <span class="RktInBG"><span class="hspace"></span><span class="RktIn">|</span><span class="hspace"></span></span> <span class="RktInBG"><span class="hspace"></span><span class="RktIn">;</span><span class="hspace"></span></span>
7 <span class="RktInBG"><span class="hspace"></span><span class="RktIn">#</span><span class="hspace"></span></span></div><div class="SIntrapara">A <span class="RktVar">number</span> is a number such as <span class="RktVal">123</span>, <span class="RktVal">3/2</span>, or
8 <span class="RktVal">5.5</span>.</div><div class="SIntrapara">A <span class="RktVar">string</span> is enclosed by a pair of <span class="RktInBG"><span class="hspace"></span><span class="RktIn">"</span><span class="hspace"></span></span>. Unlike
9 symbols, strings may be split into characters and manipulated by a
10 variety of primitive functions.  For example, <span class="RktVal">"abcdef"</span>,
11 <span class="RktVal">"This is a string"</span>, and <span class="RktVal">"This is a string with \" inside"</span> are all strings.</div><div class="SIntrapara">A <span class="RktVar">character</span> begins with <span class="RktInBG"><span class="hspace"></span><span class="RktIn">#\</span><span class="hspace"></span></span> and has the
12 name of the character. For example, <span class="RktVal">#\a</span>, <span class="RktVal">#\b</span>,
13 and <span class="RktVal">#\space</span> are characters.</div><p></p><p><table cellspacing="0"><tbody><tr><td><p>A <span class="RktVar">prim-op</span> is one of:</p></td></tr><tr><td><p><span class="hspace">&nbsp;</span><span style="font-weight: bold;">Numbers: Integers, Rationals, Reals, Complex, Exacts, Inexacts</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._%7E3c%29%29" class="RktValLink" pltdoc="x">&lt;</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">real</span><span class="hspace">&nbsp;</span><span class="RktSym">real</span><span class="hspace">&nbsp;</span><span class="RktSym">real</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._%7E3c%7E3d%29%29" class="RktValLink" pltdoc="x">&lt;=</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">real</span><span class="hspace">&nbsp;</span><span class="RktSym">real</span><span class="hspace">&nbsp;</span><span class="RktSym">real</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._%7E3d%29%29" class="RktValLink" pltdoc="x">=</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">number</span><span class="hspace">&nbsp;</span><span class="RktSym">number</span><span class="hspace">&nbsp;</span><span class="RktSym">number</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._%7E3e%29%29" class="RktValLink" pltdoc="x">&gt;</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">real</span><span class="hspace">&nbsp;</span><span class="RktSym">real</span><span class="hspace">&nbsp;</span><span class="RktSym">real</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._%7E3e%7E3d%29%29" class="RktValLink" pltdoc="x">&gt;=</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">real</span><span class="hspace">&nbsp;</span><span class="RktSym">real</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._abs%29%29" class="RktValLink" pltdoc="x">abs</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">real</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">real</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._acos%29%29" class="RktValLink" pltdoc="x">acos</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">number</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">number</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._add1%29%29" class="RktValLink" pltdoc="x">add1</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">number</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">number</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._angle%29%29" class="RktValLink" pltdoc="x">angle</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">number</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">real</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._asin%29%29" class="RktValLink" pltdoc="x">asin</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">number</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">number</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._atan%29%29" class="RktValLink" pltdoc="x">atan</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">number</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">number</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._ceiling%29%29" class="RktValLink" pltdoc="x">ceiling</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">real</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">integer</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._complex%7E3f%29%29" class="RktValLink" pltdoc="x">complex?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._conjugate%29%29" class="RktValLink" pltdoc="x">conjugate</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">number</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">number</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._cos%29%29" class="RktValLink" pltdoc="x">cos</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">number</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">number</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._cosh%29%29" class="RktValLink" pltdoc="x">cosh</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">number</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">number</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._current-seconds%29%29" class="RktValLink" pltdoc="x">current-seconds</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">integer</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._denominator%29%29" class="RktValLink" pltdoc="x">denominator</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">rat</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">integer</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._e%29%29" class="RktValLink" pltdoc="x">e</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktSym">real</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._even%7E3f%29%29" class="RktValLink" pltdoc="x">even?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">integer</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._exact-%7E3einexact%29%29" class="RktValLink" pltdoc="x">exact-&gt;inexact</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">number</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">number</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._exact%7E3f%29%29" class="RktValLink" pltdoc="x">exact?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">number</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._exp%29%29" class="RktValLink" pltdoc="x">exp</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">number</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">number</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._expt%29%29" class="RktValLink" pltdoc="x">expt</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">number</span><span class="hspace">&nbsp;</span><span class="RktSym">number</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">number</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._floor%29%29" class="RktValLink" pltdoc="x">floor</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">real</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">integer</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._gcd%29%29" class="RktValLink" pltdoc="x">gcd</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">integer</span><span class="hspace">&nbsp;</span><span class="RktSym">integer</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">integer</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._imag-part%29%29" class="RktValLink" pltdoc="x">imag-part</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">number</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">real</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._inexact-%7E3eexact%29%29" class="RktValLink" pltdoc="x">inexact-&gt;exact</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">number</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">number</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._inexact%7E3f%29%29" class="RktValLink" pltdoc="x">inexact?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">number</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._integer-%7E3echar%29%29" class="RktValLink" pltdoc="x">integer-&gt;char</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">integer</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">char</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._integer-sqrt%29%29" class="RktValLink" pltdoc="x">integer-sqrt</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">number</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">integer</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._integer%7E3f%29%29" class="RktValLink" pltdoc="x">integer?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._lcm%29%29" class="RktValLink" pltdoc="x">lcm</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">integer</span><span class="hspace">&nbsp;</span><span class="RktSym">integer</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">integer</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._log%29%29" class="RktValLink" pltdoc="x">log</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">number</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">number</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._magnitude%29%29" class="RktValLink" pltdoc="x">magnitude</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">number</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">real</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._make-polar%29%29" class="RktValLink" pltdoc="x">make-polar</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">real</span><span class="hspace">&nbsp;</span><span class="RktSym">real</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">number</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._make-rectangular%29%29" class="RktValLink" pltdoc="x">make-rectangular</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">real</span><span class="hspace">&nbsp;</span><span class="RktSym">real</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">number</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._max%29%29" class="RktValLink" pltdoc="x">max</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">real</span><span class="hspace">&nbsp;</span><span class="RktSym">real</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">real</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._min%29%29" class="RktValLink" pltdoc="x">min</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">real</span><span class="hspace">&nbsp;</span><span class="RktSym">real</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">real</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._modulo%29%29" class="RktValLink" pltdoc="x">modulo</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">integer</span><span class="hspace">&nbsp;</span><span class="RktSym">integer</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">integer</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._negative%7E3f%29%29" class="RktValLink" pltdoc="x">negative?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">number</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._number-%7E3estring%29%29" class="RktValLink" pltdoc="x">number-&gt;string</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">number</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">string</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._number%7E3f%29%29" class="RktValLink" pltdoc="x">number?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._numerator%29%29" class="RktValLink" pltdoc="x">numerator</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">rat</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">integer</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._odd%7E3f%29%29" class="RktValLink" pltdoc="x">odd?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">integer</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._pi%29%29" class="RktValLink" pltdoc="x">pi</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktSym">real</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._positive%7E3f%29%29" class="RktValLink" pltdoc="x">positive?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">number</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._quotient%29%29" class="RktValLink" pltdoc="x">quotient</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">integer</span><span class="hspace">&nbsp;</span><span class="RktSym">integer</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">integer</span><span class="RktPn">)</span></p></td></tr><tr><td><table class="prototype" cellspacing="0"><tbody><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._random%29%29" class="RktValLink" pltdoc="x">random</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span></p></td><td><table class="RktBlk" cellspacing="0"><tbody><tr><td><span class="RktPn">(</span><span class="RktSym">case-&gt;</span></td></tr><tr><td><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">integer</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">integer</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">and/c</span><span class="hspace">&nbsp;</span><span class="RktSym">real</span><span class="hspace">&nbsp;</span><span class="RktSym">inexact?</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">&gt;/c</span><span class="hspace">&nbsp;</span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">&lt;/c</span><span class="hspace">&nbsp;</span><span class="RktVal">1</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr></tbody></table></td></tr></tbody></table></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._rational%7E3f%29%29" class="RktValLink" pltdoc="x">rational?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._real-part%29%29" class="RktValLink" pltdoc="x">real-part</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">number</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">real</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._real%7E3f%29%29" class="RktValLink" pltdoc="x">real?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._remainder%29%29" class="RktValLink" pltdoc="x">remainder</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">integer</span><span class="hspace">&nbsp;</span><span class="RktSym">integer</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">integer</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._round%29%29" class="RktValLink" pltdoc="x">round</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">real</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">integer</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._sgn%29%29" class="RktValLink" pltdoc="x">sgn</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">real</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">union</span><span class="hspace">&nbsp;</span><span class="RktVal">1</span><span class="hspace">&nbsp;</span><span class="RktVal">1.0</span><span class="hspace">&nbsp;</span><span class="RktVal">0</span><span class="hspace">&nbsp;</span><span class="RktVal">0.0</span><span class="hspace">&nbsp;</span><span class="RktVal">-1</span><span class="hspace">&nbsp;</span><span class="RktVal">-1.0</span><span class="RktPn">)</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._sin%29%29" class="RktValLink" pltdoc="x">sin</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">number</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">number</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._sinh%29%29" class="RktValLink" pltdoc="x">sinh</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">number</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">number</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._sqr%29%29" class="RktValLink" pltdoc="x">sqr</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">number</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">number</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._sqrt%29%29" class="RktValLink" pltdoc="x">sqrt</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">number</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">number</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._sub1%29%29" class="RktValLink" pltdoc="x">sub1</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">number</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">number</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._tan%29%29" class="RktValLink" pltdoc="x">tan</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">number</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">number</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._zero%7E3f%29%29" class="RktValLink" pltdoc="x">zero?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">number</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;</span><span style="font-weight: bold;">Booleans</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._boolean%7E3d%7E3f%29%29" class="RktValLink" pltdoc="x">boolean=?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">boolean</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._boolean%7E3f%29%29" class="RktValLink" pltdoc="x">boolean?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._false%7E3f%29%29" class="RktValLink" pltdoc="x">false?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._not%29%29" class="RktValLink" pltdoc="x">not</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">boolean</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;</span><span style="font-weight: bold;">Symbols</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._symbol-%7E3estring%29%29" class="RktValLink" pltdoc="x">symbol-&gt;string</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">symbol</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">string</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._symbol%7E3d%7E3f%29%29" class="RktValLink" pltdoc="x">symbol=?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">symbol</span><span class="hspace">&nbsp;</span><span class="RktSym">symbol</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._symbol%7E3f%29%29" class="RktValLink" pltdoc="x">symbol?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;</span><span style="font-weight: bold;">Lists</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._append%29%29" class="RktValLink" pltdoc="x">append</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">any</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">any</span><span class="RktPn">)</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._assoc%29%29" class="RktValLink" pltdoc="x">assoc</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">any</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">any</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">or</span><span class="hspace">&nbsp;</span><span class="RktSym">false</span><span class="RktPn">)</span></p></td></tr><tr><td><table class="prototype" cellspacing="0"><tbody><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._assq%29%29" class="RktValLink" pltdoc="x">assq</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span></p></td><td><table class="RktBlk" cellspacing="0"><tbody><tr><td><span class="RktPn">(</span><span class="RktSym">X</span></td></tr><tr><td><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">cons</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span></td></tr><tr><td><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">union</span><span class="hspace">&nbsp;</span><span class="RktSym">false</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">cons</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr></tbody></table></td></tr></tbody></table></td></tr><tr><td><table class="prototype" cellspacing="0"><tbody><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._caaar%29%29" class="RktValLink" pltdoc="x">caaar</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span></p></td><td><table class="RktBlk" cellspacing="0"><tbody><tr><td><span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">cons</span></td></tr><tr><td><span class="hspace">&nbsp;&nbsp;</span><span class="RktPn">(</span><span class="RktSym">cons</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">cons</span><span class="hspace">&nbsp;</span><span class="RktSym">W</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">Z</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace">&nbsp;&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span></td></tr><tr><td><span class="hspace">&nbsp;</span><span class="RktSym">W</span><span class="RktPn">)</span></td></tr></tbody></table></td></tr></tbody></table></td></tr><tr><td><table class="prototype" cellspacing="0"><tbody><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._caadr%29%29" class="RktValLink" pltdoc="x">caadr</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span></p></td><td><table class="RktBlk" cellspacing="0"><tbody><tr><td><span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">cons</span></td></tr><tr><td><span class="hspace">&nbsp;&nbsp;</span><span class="RktPn">(</span><span class="RktSym">cons</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">cons</span><span class="hspace">&nbsp;</span><span class="RktSym">W</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">Z</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace">&nbsp;&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span></td></tr><tr><td><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">Z</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr></tbody></table></td></tr></tbody></table></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._caar%29%29" class="RktValLink" pltdoc="x">caar</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">cons</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">cons</span><span class="hspace">&nbsp;</span><span class="RktSym">Z</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">Z</span><span class="RktPn">)</span></p></td></tr><tr><td><table class="prototype" cellspacing="0"><tbody><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._cadar%29%29" class="RktValLink" pltdoc="x">cadar</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span></p></td><td><table class="RktBlk" cellspacing="0"><tbody><tr><td><span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">cons</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">cons</span><span class="hspace">&nbsp;</span><span class="RktSym">W</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">cons</span><span class="hspace">&nbsp;</span><span class="RktSym">Z</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span></td></tr><tr><td><span class="hspace">&nbsp;</span><span class="RktSym">Z</span><span class="RktPn">)</span></td></tr></tbody></table></td></tr></tbody></table></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._cadddr%29%29" class="RktValLink" pltdoc="x">cadddr</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._caddr%29%29" class="RktValLink" pltdoc="x">caddr</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">cons</span><span class="hspace">&nbsp;</span><span class="RktSym">W</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">cons</span><span class="hspace">&nbsp;</span><span class="RktSym">Z</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">cons</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._cadr%29%29" class="RktValLink" pltdoc="x">cadr</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">cons</span><span class="hspace">&nbsp;</span><span class="RktSym">Z</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">cons</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._car%29%29" class="RktValLink" pltdoc="x">car</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">cons</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span></p></td></tr><tr><td><table class="prototype" cellspacing="0"><tbody><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._cdaar%29%29" class="RktValLink" pltdoc="x">cdaar</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span></p></td><td><table class="RktBlk" cellspacing="0"><tbody><tr><td><span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">cons</span></td></tr><tr><td><span class="hspace">&nbsp;&nbsp;</span><span class="RktPn">(</span><span class="RktSym">cons</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">cons</span><span class="hspace">&nbsp;</span><span class="RktSym">W</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">Z</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace">&nbsp;&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span></td></tr><tr><td><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">Z</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr></tbody></table></td></tr></tbody></table></td></tr><tr><td><table class="prototype" cellspacing="0"><tbody><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._cdadr%29%29" class="RktValLink" pltdoc="x">cdadr</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span></p></td><td><table class="RktBlk" cellspacing="0"><tbody><tr><td><span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">cons</span><span class="hspace">&nbsp;</span><span class="RktSym">W</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">cons</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">cons</span><span class="hspace">&nbsp;</span><span class="RktSym">Z</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span></td></tr><tr><td><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr></tbody></table></td></tr></tbody></table></td></tr><tr><td><table class="prototype" cellspacing="0"><tbody><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._cdar%29%29" class="RktValLink" pltdoc="x">cdar</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span></p></td><td><table class="RktBlk" cellspacing="0"><tbody><tr><td><span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">cons</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">cons</span><span class="hspace">&nbsp;</span><span class="RktSym">Z</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span></td></tr><tr><td><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr></tbody></table></td></tr></tbody></table></td></tr><tr><td><table class="prototype" cellspacing="0"><tbody><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._cddar%29%29" class="RktValLink" pltdoc="x">cddar</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span></p></td><td><table class="RktBlk" cellspacing="0"><tbody><tr><td><span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">cons</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">cons</span><span class="hspace">&nbsp;</span><span class="RktSym">W</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">cons</span><span class="hspace">&nbsp;</span><span class="RktSym">Z</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span></td></tr><tr><td><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr></tbody></table></td></tr></tbody></table></td></tr><tr><td><table class="prototype" cellspacing="0"><tbody><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._cdddr%29%29" class="RktValLink" pltdoc="x">cdddr</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span></p></td><td><table class="RktBlk" cellspacing="0"><tbody><tr><td><span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">cons</span><span class="hspace">&nbsp;</span><span class="RktSym">W</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">cons</span><span class="hspace">&nbsp;</span><span class="RktSym">Z</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">cons</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span></td></tr><tr><td><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr></tbody></table></td></tr></tbody></table></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._cddr%29%29" class="RktValLink" pltdoc="x">cddr</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">cons</span><span class="hspace">&nbsp;</span><span class="RktSym">Z</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">cons</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._cdr%29%29" class="RktValLink" pltdoc="x">cdr</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">cons</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._cons%29%29" class="RktValLink" pltdoc="x">cons</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._cons%7E3f%29%29" class="RktValLink" pltdoc="x">cons?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._eighth%29%29" class="RktValLink" pltdoc="x">eighth</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._empty%7E3f%29%29" class="RktValLink" pltdoc="x">empty?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._fifth%29%29" class="RktValLink" pltdoc="x">fifth</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._first%29%29" class="RktValLink" pltdoc="x">first</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">cons</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._fourth%29%29" class="RktValLink" pltdoc="x">fourth</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._length%29%29" class="RktValLink" pltdoc="x">length</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">any</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">number</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._list%29%29" class="RktValLink" pltdoc="x">list</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">any</span><span class="RktPn">)</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._list*%29%29" class="RktValLink" pltdoc="x">list*</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">any</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">any</span><span class="RktPn">)</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._list-ref%29%29" class="RktValLink" pltdoc="x">list-ref</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">natural-number</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._list%7E3f%29%29" class="RktValLink" pltdoc="x">list?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._make-list%29%29" class="RktValLink" pltdoc="x">make-list</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">natural-number</span><span class="hspace">&nbsp;</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">any</span><span class="RktPn">)</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._member%29%29" class="RktValLink" pltdoc="x">member</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">any</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._member%7E3f%29%29" class="RktValLink" pltdoc="x">member?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">any</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._memq%29%29" class="RktValLink" pltdoc="x">memq</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">any</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">union</span><span class="hspace">&nbsp;</span><span class="RktSym">false</span><span class="hspace">&nbsp;</span><span class="RktSym">list</span><span class="RktPn">)</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._memv%29%29" class="RktValLink" pltdoc="x">memv</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">any</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">union</span><span class="hspace">&nbsp;</span><span class="RktSym">false</span><span class="hspace">&nbsp;</span><span class="RktSym">list</span><span class="RktPn">)</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._null%29%29" class="RktValLink" pltdoc="x">null</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktSym">empty</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._null%7E3f%29%29" class="RktValLink" pltdoc="x">null?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._pair%7E3f%29%29" class="RktValLink" pltdoc="x">pair?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._remove%29%29" class="RktValLink" pltdoc="x">remove</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">any</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">any</span><span class="RktPn">)</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._rest%29%29" class="RktValLink" pltdoc="x">rest</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">cons</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._reverse%29%29" class="RktValLink" pltdoc="x">reverse</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">any</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">list</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._second%29%29" class="RktValLink" pltdoc="x">second</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">cons</span><span class="hspace">&nbsp;</span><span class="RktSym">Z</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">cons</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._seventh%29%29" class="RktValLink" pltdoc="x">seventh</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._sixth%29%29" class="RktValLink" pltdoc="x">sixth</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._third%29%29" class="RktValLink" pltdoc="x">third</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">cons</span><span class="hspace">&nbsp;</span><span class="RktSym">W</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">cons</span><span class="hspace">&nbsp;</span><span class="RktSym">Z</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">cons</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;</span><span style="font-weight: bold;">Posns</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._make-posn%29%29" class="RktValLink" pltdoc="x">make-posn</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">number</span><span class="hspace">&nbsp;</span><span class="RktSym">number</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">posn</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._posn%29%29" class="RktValLink" pltdoc="x">posn</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktSym">signature</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._posn-x%29%29" class="RktValLink" pltdoc="x">posn-x</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">posn</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">number</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._posn-y%29%29" class="RktValLink" pltdoc="x">posn-y</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">posn</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">number</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._posn%7E3f%29%29" class="RktValLink" pltdoc="x">posn?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">anything</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._set-posn-x%21%29%29" class="RktValLink" pltdoc="x">set-posn-x!</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">posn</span><span class="hspace">&nbsp;</span><span class="RktSym">number</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">void</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._set-posn-y%21%29%29" class="RktValLink" pltdoc="x">set-posn-y!</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">posn</span><span class="hspace">&nbsp;</span><span class="RktSym">number</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">void</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;</span><span style="font-weight: bold;">Characters</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._char-%7E3einteger%29%29" class="RktValLink" pltdoc="x">char-&gt;integer</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">char</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">integer</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._char-alphabetic%7E3f%29%29" class="RktValLink" pltdoc="x">char-alphabetic?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">char</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._char-ci%7E3c%7E3d%7E3f%29%29" class="RktValLink" pltdoc="x">char-ci&lt;=?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">char</span><span class="hspace">&nbsp;</span><span class="RktSym">char</span><span class="hspace">&nbsp;</span><span class="RktSym">char</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._char-ci%7E3c%7E3f%29%29" class="RktValLink" pltdoc="x">char-ci&lt;?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">char</span><span class="hspace">&nbsp;</span><span class="RktSym">char</span><span class="hspace">&nbsp;</span><span class="RktSym">char</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._char-ci%7E3d%7E3f%29%29" class="RktValLink" pltdoc="x">char-ci=?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">char</span><span class="hspace">&nbsp;</span><span class="RktSym">char</span><span class="hspace">&nbsp;</span><span class="RktSym">char</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._char-ci%7E3e%7E3d%7E3f%29%29" class="RktValLink" pltdoc="x">char-ci&gt;=?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">char</span><span class="hspace">&nbsp;</span><span class="RktSym">char</span><span class="hspace">&nbsp;</span><span class="RktSym">char</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._char-ci%7E3e%7E3f%29%29" class="RktValLink" pltdoc="x">char-ci&gt;?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">char</span><span class="hspace">&nbsp;</span><span class="RktSym">char</span><span class="hspace">&nbsp;</span><span class="RktSym">char</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._char-downcase%29%29" class="RktValLink" pltdoc="x">char-downcase</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">char</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">char</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._char-lower-case%7E3f%29%29" class="RktValLink" pltdoc="x">char-lower-case?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">char</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._char-numeric%7E3f%29%29" class="RktValLink" pltdoc="x">char-numeric?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">char</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._char-upcase%29%29" class="RktValLink" pltdoc="x">char-upcase</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">char</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">char</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._char-upper-case%7E3f%29%29" class="RktValLink" pltdoc="x">char-upper-case?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">char</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._char-whitespace%7E3f%29%29" class="RktValLink" pltdoc="x">char-whitespace?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">char</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._char%7E3c%7E3d%7E3f%29%29" class="RktValLink" pltdoc="x">char&lt;=?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">char</span><span class="hspace">&nbsp;</span><span class="RktSym">char</span><span class="hspace">&nbsp;</span><span class="RktSym">char</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._char%7E3c%7E3f%29%29" class="RktValLink" pltdoc="x">char&lt;?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">char</span><span class="hspace">&nbsp;</span><span class="RktSym">char</span><span class="hspace">&nbsp;</span><span class="RktSym">char</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._char%7E3d%7E3f%29%29" class="RktValLink" pltdoc="x">char=?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">char</span><span class="hspace">&nbsp;</span><span class="RktSym">char</span><span class="hspace">&nbsp;</span><span class="RktSym">char</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._char%7E3e%7E3d%7E3f%29%29" class="RktValLink" pltdoc="x">char&gt;=?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">char</span><span class="hspace">&nbsp;</span><span class="RktSym">char</span><span class="hspace">&nbsp;</span><span class="RktSym">char</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._char%7E3e%7E3f%29%29" class="RktValLink" pltdoc="x">char&gt;?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">char</span><span class="hspace">&nbsp;</span><span class="RktSym">char</span><span class="hspace">&nbsp;</span><span class="RktSym">char</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._char%7E3f%29%29" class="RktValLink" pltdoc="x">char?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;</span><span style="font-weight: bold;">Strings</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._explode%29%29" class="RktValLink" pltdoc="x">explode</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">string</span><span class="RktPn">)</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._format%29%29" class="RktValLink" pltdoc="x">format</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">string</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._implode%29%29" class="RktValLink" pltdoc="x">implode</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">string</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">string</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._int-%7E3estring%29%29" class="RktValLink" pltdoc="x">int-&gt;string</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">integer</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">string</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._list-%7E3estring%29%29" class="RktValLink" pltdoc="x">list-&gt;string</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">char</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">string</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._make-string%29%29" class="RktValLink" pltdoc="x">make-string</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">nat</span><span class="hspace">&nbsp;</span><span class="RktSym">char</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">string</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._replicate%29%29" class="RktValLink" pltdoc="x">replicate</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">nat</span><span class="hspace">&nbsp;</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">string</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._string%29%29" class="RktValLink" pltdoc="x">string</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">char</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">string</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._string-%7E3eint%29%29" class="RktValLink" pltdoc="x">string-&gt;int</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">integer</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._string-%7E3elist%29%29" class="RktValLink" pltdoc="x">string-&gt;list</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">char</span><span class="RktPn">)</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._string-%7E3enumber%29%29" class="RktValLink" pltdoc="x">string-&gt;number</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">union</span><span class="hspace">&nbsp;</span><span class="RktSym">number</span><span class="hspace">&nbsp;</span><span class="RktSym">false</span><span class="RktPn">)</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._string-%7E3esymbol%29%29" class="RktValLink" pltdoc="x">string-&gt;symbol</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">symbol</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._string-alphabetic%7E3f%29%29" class="RktValLink" pltdoc="x">string-alphabetic?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._string-append%29%29" class="RktValLink" pltdoc="x">string-append</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">string</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._string-ci%7E3c%7E3d%7E3f%29%29" class="RktValLink" pltdoc="x">string-ci&lt;=?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._string-ci%7E3c%7E3f%29%29" class="RktValLink" pltdoc="x">string-ci&lt;?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._string-ci%7E3d%7E3f%29%29" class="RktValLink" pltdoc="x">string-ci=?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._string-ci%7E3e%7E3d%7E3f%29%29" class="RktValLink" pltdoc="x">string-ci&gt;=?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._string-ci%7E3e%7E3f%29%29" class="RktValLink" pltdoc="x">string-ci&gt;?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._string-copy%29%29" class="RktValLink" pltdoc="x">string-copy</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">string</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._string-ith%29%29" class="RktValLink" pltdoc="x">string-ith</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">nat</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">string</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._string-length%29%29" class="RktValLink" pltdoc="x">string-length</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">nat</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._string-lower-case%7E3f%29%29" class="RktValLink" pltdoc="x">string-lower-case?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._string-numeric%7E3f%29%29" class="RktValLink" pltdoc="x">string-numeric?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._string-ref%29%29" class="RktValLink" pltdoc="x">string-ref</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">nat</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">char</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._string-upper-case%7E3f%29%29" class="RktValLink" pltdoc="x">string-upper-case?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._string-whitespace%7E3f%29%29" class="RktValLink" pltdoc="x">string-whitespace?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._string%7E3c%7E3d%7E3f%29%29" class="RktValLink" pltdoc="x">string&lt;=?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._string%7E3c%7E3f%29%29" class="RktValLink" pltdoc="x">string&lt;?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._string%7E3d%7E3f%29%29" class="RktValLink" pltdoc="x">string=?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._string%7E3e%7E3d%7E3f%29%29" class="RktValLink" pltdoc="x">string&gt;=?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._string%7E3e%7E3f%29%29" class="RktValLink" pltdoc="x">string&gt;?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._string%7E3f%29%29" class="RktValLink" pltdoc="x">string?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._substring%29%29" class="RktValLink" pltdoc="x">substring</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">nat</span><span class="hspace">&nbsp;</span><span class="RktSym">nat</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">string</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;</span><span style="font-weight: bold;">Images</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._image%7E3d%7E3f%29%29" class="RktValLink" pltdoc="x">image=?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">image</span><span class="hspace">&nbsp;</span><span class="RktSym">image</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._image%7E3f%29%29" class="RktValLink" pltdoc="x">image?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;</span><span style="font-weight: bold;">Misc</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._%7E3d%7E7e%29%29" class="RktValLink" pltdoc="x">=~</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">real</span><span class="hspace">&nbsp;</span><span class="RktSym">real</span><span class="hspace">&nbsp;</span><span class="RktSym">non-negative-real</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._current-milliseconds%29%29" class="RktValLink" pltdoc="x">current-milliseconds</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">exact-integer</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._eof%29%29" class="RktValLink" pltdoc="x">eof</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktSym">eof</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._eof-object%7E3f%29%29" class="RktValLink" pltdoc="x">eof-object?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._eq%7E3f%29%29" class="RktValLink" pltdoc="x">eq?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._equal%7E3f%29%29" class="RktValLink" pltdoc="x">equal?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._equal%7E7e%7E3f%29%29" class="RktValLink" pltdoc="x">equal~?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktSym">non-negative-real</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._eqv%7E3f%29%29" class="RktValLink" pltdoc="x">eqv?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._error%29%29" class="RktValLink" pltdoc="x">error</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">void</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._exit%29%29" class="RktValLink" pltdoc="x">exit</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">void</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._force%29%29" class="RktValLink" pltdoc="x">force</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">delay</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">any</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._gensym%29%29" class="RktValLink" pltdoc="x">gensym</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">symbol?</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._identity%29%29" class="RktValLink" pltdoc="x">identity</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">any</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._promise%7E3f%29%29" class="RktValLink" pltdoc="x">promise?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._sleep%29%29" class="RktValLink" pltdoc="x">sleep</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">positive-number</span><span class="hspace">&nbsp;</span><span class="RktSym">void</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._struct%7E3f%29%29" class="RktValLink" pltdoc="x">struct?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._void%29%29" class="RktValLink" pltdoc="x">void</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">void</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._void%7E3f%29%29" class="RktValLink" pltdoc="x">void?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;</span><span style="font-weight: bold;">Numbers (relaxed conditions)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._*%29%29" class="RktValLink" pltdoc="x">*</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">number</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">number</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._+%29%29" class="RktValLink" pltdoc="x">+</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">number</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">number</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._-%29%29" class="RktValLink" pltdoc="x">-</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">number</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">number</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._/%29%29" class="RktValLink" pltdoc="x">/</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">number</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">number</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;</span><span style="font-weight: bold;">Higher-Order Functions</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._andmap%29%29" class="RktValLink" pltdoc="x">andmap</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><table class="prototype" cellspacing="0"><tbody><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._apply%29%29" class="RktValLink" pltdoc="x">apply</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span></p></td><td><table class="RktBlk" cellspacing="0"><tbody><tr><td><span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">X-1</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">X-N</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace">&nbsp;</span><span class="RktSym">X-1</span></td></tr><tr><td><span class="hspace">&nbsp;</span><span class="RktSym">...</span></td></tr><tr><td><span class="hspace">&nbsp;</span><span class="RktSym">X-i</span></td></tr><tr><td><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">list</span><span class="hspace">&nbsp;</span><span class="RktSym">X-i+1</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">X-N</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span></td></tr><tr><td><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span></td></tr></tbody></table></td></tr></tbody></table></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._argmax%29%29" class="RktValLink" pltdoc="x">argmax</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">real</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._argmin%29%29" class="RktValLink" pltdoc="x">argmin</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">real</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._build-list%29%29" class="RktValLink" pltdoc="x">build-list</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">nat</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">nat</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._build-string%29%29" class="RktValLink" pltdoc="x">build-string</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">nat</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">nat</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">char</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">string</span><span class="RktPn">)</span></p></td></tr><tr><td><table class="prototype" cellspacing="0"><tbody><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._compose%29%29" class="RktValLink" pltdoc="x">compose</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span></p></td><td><table class="RktBlk" cellspacing="0"><tbody><tr><td><span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">Y-1</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">Z</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace">&nbsp;</span><span class="RktSym">...</span></td></tr><tr><td><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">Y-N</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">Y-N-1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">X-1</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">X-N</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">Y-N</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span></td></tr><tr><td><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">X-1</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">X-N</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">Z</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr></tbody></table></td></tr></tbody></table></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._filter%29%29" class="RktValLink" pltdoc="x">filter</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._foldl%29%29" class="RktValLink" pltdoc="x">foldl</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._foldr%29%29" class="RktValLink" pltdoc="x">foldr</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._for-each%29%29" class="RktValLink" pltdoc="x">for-each</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">any</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">any</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">void</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._map%29%29" class="RktValLink" pltdoc="x">map</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">Z</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">Z</span><span class="RktPn">)</span><span class="RktPn">)</span></p></td></tr><tr><td><table class="prototype" cellspacing="0"><tbody><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._memf%29%29" class="RktValLink" pltdoc="x">memf</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span></p></td><td><table class="RktBlk" cellspacing="0"><tbody><tr><td><span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span></td></tr><tr><td><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">union</span><span class="hspace">&nbsp;</span><span class="RktSym">false</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr></tbody></table></td></tr></tbody></table></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._ormap%29%29" class="RktValLink" pltdoc="x">ormap</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._procedure%7E3f%29%29" class="RktValLink" pltdoc="x">procedure?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._quicksort%29%29" class="RktValLink" pltdoc="x">quicksort</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._sort%29%29" class="RktValLink" pltdoc="x">sort</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;</span><span style="font-weight: bold;">Reading and Printing</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._display%29%29" class="RktValLink" pltdoc="x">display</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">void</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._newline%29%29" class="RktValLink" pltdoc="x">newline</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">void</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._pretty-print%29%29" class="RktValLink" pltdoc="x">pretty-print</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">void</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._print%29%29" class="RktValLink" pltdoc="x">print</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">void</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._printf%29%29" class="RktValLink" pltdoc="x">printf</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">void</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._read%29%29" class="RktValLink" pltdoc="x">read</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">sexp</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._with-input-from-file%29%29" class="RktValLink" pltdoc="x">with-input-from-file</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">any</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">any</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._with-input-from-string%29%29" class="RktValLink" pltdoc="x">with-input-from-string</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">any</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">any</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._with-output-to-file%29%29" class="RktValLink" pltdoc="x">with-output-to-file</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">any</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">any</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._with-output-to-string%29%29" class="RktValLink" pltdoc="x">with-output-to-string</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">string</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">any</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">any</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._write%29%29" class="RktValLink" pltdoc="x">write</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">void</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;</span><span style="font-weight: bold;">Vectors</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._build-vector%29%29" class="RktValLink" pltdoc="x">build-vector</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">nat</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">nat</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">vectorof</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._make-vector%29%29" class="RktValLink" pltdoc="x">make-vector</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">number</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">vectorof</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._vector%29%29" class="RktValLink" pltdoc="x">vector</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">vector</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="RktPn">)</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._vector-length%29%29" class="RktValLink" pltdoc="x">vector-length</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">vector</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">nat</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._vector-ref%29%29" class="RktValLink" pltdoc="x">vector-ref</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">vector</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">nat</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._vector-set%21%29%29" class="RktValLink" pltdoc="x">vector-set!</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">vectorof</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">nat</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">void</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._vector%7E3f%29%29" class="RktValLink" pltdoc="x">vector?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;</span><span style="font-weight: bold;">Boxes</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._box%29%29" class="RktValLink" pltdoc="x">box</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">box</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._box%7E3f%29%29" class="RktValLink" pltdoc="x">box?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._set-box%21%29%29" class="RktValLink" pltdoc="x">set-box!</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">box</span><span class="hspace">&nbsp;</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">void</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._unbox%29%29" class="RktValLink" pltdoc="x">unbox</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">box</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">any</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;</span><span style="font-weight: bold;">Hash Tables</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._hash-copy%29%29" class="RktValLink" pltdoc="x">hash-copy</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">hash</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">hash</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._hash-count%29%29" class="RktValLink" pltdoc="x">hash-count</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">hash</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">integer</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._hash-eq%7E3f%29%29" class="RktValLink" pltdoc="x">hash-eq?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">hash</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._hash-equal%7E3f%29%29" class="RktValLink" pltdoc="x">hash-equal?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">hash</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._hash-eqv%7E3f%29%29" class="RktValLink" pltdoc="x">hash-eqv?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">hash</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._hash-for-each%29%29" class="RktValLink" pltdoc="x">hash-for-each</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">hash</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">any</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">void</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._hash-has-key%7E3f%29%29" class="RktValLink" pltdoc="x">hash-has-key?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">hash</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._hash-map%29%29" class="RktValLink" pltdoc="x">hash-map</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">hash</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">A</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktSym">A</span><span class="RktPn">)</span><span class="RktPn">)</span></p></td></tr><tr><td><table class="prototype" cellspacing="0"><tbody><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._hash-ref%29%29" class="RktValLink" pltdoc="x">hash-ref</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span></p></td><td><table class="RktBlk" cellspacing="0"><tbody><tr><td><span class="RktPn">(</span><span class="RktSym">case-&gt;</span></td></tr><tr><td><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">hash</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">hash</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">hash</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr></tbody></table></td></tr></tbody></table></td></tr><tr><td><table class="prototype" cellspacing="0"><tbody><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._hash-ref%21%29%29" class="RktValLink" pltdoc="x">hash-ref!</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span></p></td><td><table class="RktBlk" cellspacing="0"><tbody><tr><td><span class="RktPn">(</span><span class="RktSym">case-&gt;</span></td></tr><tr><td><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">hash</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">hash</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr></tbody></table></td></tr></tbody></table></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._hash-remove%21%29%29" class="RktValLink" pltdoc="x">hash-remove!</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">hash</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">void</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._hash-set%21%29%29" class="RktValLink" pltdoc="x">hash-set!</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">hash</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">void</span><span class="RktPn">)</span></p></td></tr><tr><td><table class="prototype" cellspacing="0"><tbody><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._hash-update%21%29%29" class="RktValLink" pltdoc="x">hash-update!</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span></p></td><td><table class="RktBlk" cellspacing="0"><tbody><tr><td><span class="RktPn">(</span><span class="RktSym">case-&gt;</span></td></tr><tr><td><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">hash</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">Y</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">void</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">hash</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">Y</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">void</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">hash</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">Y</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">void</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr></tbody></table></td></tr></tbody></table></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._hash%7E3f%29%29" class="RktValLink" pltdoc="x">hash?</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktSym">any</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktSym">boolean</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._make-hash%29%29" class="RktValLink" pltdoc="x">make-hash</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">list</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">hash</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._make-hasheq%29%29" class="RktValLink" pltdoc="x">make-hasheq</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">list</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">hash</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span><span class="RktPn">)</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><span class="RktSym"><a href="http://docs.racket-lang.org/htdp-langs/advanced-prim-ops.html#%28def._%28lib._htdp-advanced..ss._lang%29._%28%28lib._lang/htdp-advanced..rkt%29._make-hasheqv%29%29" class="RktValLink" pltdoc="x">make-hasheqv</a></span><span class="hspace">&nbsp;</span>:<span class="hspace">&nbsp;</span> <span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">listof</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">list</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktSym">-&gt;</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym">hash</span><span class="hspace">&nbsp;</span><span class="RktSym">X</span><span class="hspace">&nbsp;</span><span class="RktSym">Y</span><span class="RktPn">)</span><span class="RktPn">)</span></p></td></tr></tbody></table></p><div class="navsetbottom"><span class="navleft"><form class="searchform"><input class="searchbox" style="color: rgb(136, 136, 136);" value="...search manuals..." title="Enter a search string to search the manuals" onkeypress='return DoSearchKey(event, this, "5.0.1", "../");' onfocus='this.style.color="black"; this.style.textAlign="left"; if (this.value == "...search manuals...") this.value="";' onblur='if (this.value.match(/^ *$/)) { this.style.color="#888"; this.style.textAlign="center"; this.value="...search manuals..."; }' type="text"></form>&nbsp;&nbsp;<a href="http://docs.racket-lang.org/index.html" title="up to the documentation top" pltdoc="x" onclick='return GotoPLTRoot("5.0.1");'>top</a></span><span class="navright"><a href="http://docs.racket-lang.org/htdp-langs/intermediate-lambda-unchanged.html" title="backward to &quot;4.5 Unchanged Forms&quot;" pltdoc="x">← prev</a>&nbsp;&nbsp;<a href="http://docs.racket-lang.org/htdp-langs/index.html" title="up to &quot;How to Design Programs Languages&quot;" pltdoc="x">up</a>&nbsp;&nbsp;<a href="http://docs.racket-lang.org/htdp-langs/advanced-define.html" title="forward to &quot;5.1 define&quot;" pltdoc="x">next →</a></span>&nbsp;</div></div></div><div id="contextindicator">&nbsp;</div></body></html>
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