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323 lines
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<!DOCTYPE HTML>
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<HTML LANG="en-us"
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>copy-list | Common Lisp Nova Spec</TITLE
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><META CHARSET="US-ASCII"
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><LINK REL="canonical" HREF="f_copy-list.html"
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><LINK REL="next" HREF="f_list.html" TYPE="text/html" TITLE="list, list*"
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><LINK REL="prev" HREF="f_tree-equal.html" TYPE="text/html" TITLE="tree-equal"
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><LINK REL="up" HREF="14_2_Conses_Dictionary.html" TYPE="text/html" TITLE="14.2 Conses Dictionary"
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><LINK REL="start" HREF="index.html" TYPE="text/html" TITLE="Common Lisp Nova Spec"
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><META NAME="VIEWPORT" CONTENT="width=device-width, initial-scale=1.0"
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><LINK REL="STYLESHEET" HREF="dpans.css%3F3909942064.css"
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></HEAD
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><BODY
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><DIV
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><DIV CLASS="topnav"
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><DIV CLASS="breadcrumb"
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><SPAN CLASS="breadcrumb-item"
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><A HREF="index.html"
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>Common Lisp Nova Spec</A
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></SPAN
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> <SPAN CLASS="breadcrumb-item"
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>→ <A HREF="14_Conses.html"
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>14. Conses</A
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></SPAN
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> <SPAN CLASS="breadcrumb-item"
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>→ <A HREF="14_2_Conses_Dictionary.html"
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>14.2 Conses Dictionary</A
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></SPAN
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> <SPAN CLASS="breadcrumb-item"
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>→ <A HREF="f_copy-list.html"
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>copy-list</A
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></SPAN
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></DIV
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><DIV CLASS="apropos"
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><DIV CLASS="apropos-io"
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><A HREF="f_tree-equal.html" CLASS="prev"
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>←</A
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><SPAN ID="apropos-label"
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>Apropos </SPAN
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><INPUT ID="apropos" AUTOFOCUS="AUTOFOCUS" PLACEHOLDER="Type here to search" ONINPUT="aproposInput(this);" ONKEYUP="aproposKeyup(event);" ONCHANGE="aproposChange(this);" ONFOCUS="aproposFocus(this);" ONFOCUSOUT="aproposFocusout(this);"
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><A HREF="f_list.html" CLASS="next"
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>→</A
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></DIV
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><DIV ID="apropos-res"
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></DIV
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></DIV
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></DIV
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><DIV CLASS="matter"
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><DIV CLASS="com"
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><DIV CLASS="begincom"
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><HR
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><TABLE WIDTH="100%" CELLSPACING="0" CELLPADDING="0"
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><TR
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><TD ALIGN="LEFT" VALIGN="BASELINE" WIDTH="100%" CLASS="name"
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><SPAN CLASS="idx" DATA-KIND="idxref" DATA-TERM="copy-list"
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></SPAN
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><B
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>copy-list</B
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></TD
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><TD ALIGN="RIGHT" VALIGN="BASELINE" WIDTH="0" NOWRAP="NOWRAP" CLASS="ftype"
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><I
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>Function</I
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></TD
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></TR
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></TABLE
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><HR
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></DIV
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><UL CLASS="subtoc"
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></UL
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><DL
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><DT
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><B
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>Syntax</B
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></DT
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><DD
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><P CLASS="j"
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><B
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>copy-list</B
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> <SPAN CLASS="cmssi"
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>list</SPAN
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> <SPAN CLASS="arrow"
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>→</SPAN
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> <SPAN CLASS="cmssi"
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>copy</SPAN
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></P
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></DD
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><DT
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><B
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>Arguments and Values</B
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></DT
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><DD
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><P CLASS="j"
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><VAR CLASS="param"
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>list</VAR
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> — a <A HREF="26_1_Glossary.html#proper_list"
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><EM CLASS="term"
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>proper list</EM
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></A
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> or a <A HREF="26_1_Glossary.html#dotted_list"
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><EM CLASS="term"
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>dotted list</EM
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></A
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>. </P
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><P CLASS="j"
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><VAR CLASS="param"
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>copy</VAR
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> — a <A HREF="26_1_Glossary.html#list"
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><EM CLASS="term"
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>list</EM
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></A
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>.</P
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></DD
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><DT
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><B
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>Description</B
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></DT
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><DD
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><P CLASS="j"
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>Returns a <A HREF="26_1_Glossary.html#copy"
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><EM CLASS="term"
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>copy</EM
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></A
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> of <VAR CLASS="param"
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>list</VAR
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>. If <VAR CLASS="param"
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>list</VAR
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> is a <A HREF="26_1_Glossary.html#dotted_list"
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><EM CLASS="term"
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>dotted list</EM
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></A
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>, the resulting <A HREF="26_1_Glossary.html#list"
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><EM CLASS="term"
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>list</EM
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></A
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> will also be a <A HREF="26_1_Glossary.html#dotted_list"
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><EM CLASS="term"
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>dotted list</EM
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></A
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>. </P
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><P CLASS="j"
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>Only the <A HREF="26_1_Glossary.html#list_structure"
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><EM CLASS="term"
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>list structure</EM
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></A
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> of <VAR CLASS="param"
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>list</VAR
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> is copied; the <A HREF="26_1_Glossary.html#element"
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><EM CLASS="term"
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>elements</EM
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></A
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> of the resulting list are the <A HREF="26_1_Glossary.html#same"
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><EM CLASS="term"
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>same</EM
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></A
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> as the corresponding <A HREF="26_1_Glossary.html#element"
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><EM CLASS="term"
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>elements</EM
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></A
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> of the given <VAR CLASS="param"
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>list</VAR
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>.</P
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></DD
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><DT
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><B
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>Examples</B
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></DT
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><DD
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><PRE CLASS="screen"
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>(setq lst (list 1 (list 2 3))) <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> (1 (2 3))
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(setq slst lst) <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> (1 (2 3))
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(setq clst (copy-list lst)) <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> (1 (2 3))
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(eq slst lst) <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> <A HREF="26_1_Glossary.html#true"
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><EM CLASS="term"
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>true</EM
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></A
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>
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(eq clst lst) <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> <A HREF="26_1_Glossary.html#false"
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><EM CLASS="term"
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>false</EM
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></A
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>
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(equal clst lst) <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> <A HREF="26_1_Glossary.html#true"
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><EM CLASS="term"
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>true</EM
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></A
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>
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(rplaca lst "one") <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> ("one" (2 3))
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slst <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> ("one" (2 3))
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clst <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> (1 (2 3))
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(setf (caadr lst) "two") <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> "two"
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lst <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> ("one" ("two" 3))
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slst <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> ("one" ("two" 3))
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clst <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> (1 ("two" 3))</PRE
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></DD
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><DT
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><B
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>Exceptional Situations</B
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></DT
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><DD
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><P CLASS="j"
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>The consequences are undefined if <VAR CLASS="param"
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>list</VAR
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> is a <A HREF="26_1_Glossary.html#circular_list"
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><EM CLASS="term"
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>circular list</EM
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></A
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>.</P
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></DD
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><DT
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><B
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>See Also</B
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></DT
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><DD
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><P CLASS="j"
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><A HREF="f_copy-alist.html" CLASS="funref"
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><B
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>copy-alist</B
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></A
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>, <A HREF="f_copy-seq.html" CLASS="funref"
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><B
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>copy-seq</B
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></A
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>, <A HREF="f_copy-tree.html" CLASS="funref"
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><B
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>copy-tree</B
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></A
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></P
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></DD
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><DT
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><B
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>Notes</B
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></DT
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><DD
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><P CLASS="j"
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>The copy created is <A HREF="f_equal.html" CLASS="funref"
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><B
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>equal</B
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></A
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> to <VAR CLASS="param"
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>list</VAR
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>, but not <A HREF="f_eq.html" CLASS="funref"
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><B
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>eq</B
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></A
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>.</P
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></DD
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></DL
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></DIV
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></DIV
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><DIV CLASS="footer"
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><DIV CLASS="btmnav"
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><A HREF="f_tree-equal.html" CLASS="prev"
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>←</A
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><A HREF="f_list.html" CLASS="next"
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>→</A
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></DIV
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><DIV CLASS="trail"
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>Conversion to HTML copyright 2023 by Gilbert Baumann</DIV
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