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>string-trim, string-left-trim, string-right-trim | Common Lisp Nova Spec</TITLE
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>Common Lisp Nova Spec</A
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> <SPAN CLASS="breadcrumb-item"
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> <SPAN CLASS="breadcrumb-item"
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>→ <A HREF="f_string-trim.html"
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>string-trim, string-left-trim, string-right-trim</A
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><TABLE WIDTH="100%" CELLSPACING="0" CELLPADDING="0"
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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="string-trim, string-left-trim, string-right-trim"
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></SPAN
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><B
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>string-trim, string-left-trim, string-right-trim</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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><UL CLASS="subtoc"
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><DL
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>Syntax</B
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></DT
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><DD
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><TABLE CELLSPACING="0" CELLPADDING="0" RULES="GROUPS" STYLE="margin: 1ex 0"
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><TBODY
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><TR
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><TD ALIGN="LEFT" VALIGN="BASELINE" STYLE=";padding-right:3px"
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><B
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>string-trim</B
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> <SPAN CLASS="cmssi"
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>character-bag</SPAN
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> <SPAN CLASS="cmssi"
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>string</SPAN
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></TD
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><TD ALIGN="LEFT" VALIGN="BASELINE" STYLE="padding-left:3px;"
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> <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> <SPAN CLASS="cmssi"
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>trimmed-string</SPAN
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></TD
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></TR
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><TR
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><TD ALIGN="LEFT" VALIGN="BASELINE" STYLE=";padding-right:3px"
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> <B
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>string-left-trim</B
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> <SPAN CLASS="cmssi"
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>character-bag</SPAN
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> <SPAN CLASS="cmssi"
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>string</SPAN
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></TD
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><TD ALIGN="LEFT" VALIGN="BASELINE" STYLE="padding-left:3px;"
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> <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> <SPAN CLASS="cmssi"
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>trimmed-string</SPAN
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></TD
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></TR
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><TR
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><TD ALIGN="LEFT" VALIGN="BASELINE" STYLE=";padding-right:3px"
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> <B
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>string-right-trim</B
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> <SPAN CLASS="cmssi"
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>character-bag</SPAN
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> <SPAN CLASS="cmssi"
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>string</SPAN
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></TD
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><TD ALIGN="LEFT" VALIGN="BASELINE" STYLE="padding-left:3px;"
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> <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> <SPAN CLASS="cmssi"
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>trimmed-string</SPAN
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></TD
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></TR
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></TBODY
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></TABLE
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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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>character-bag</VAR
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> — a <A HREF="26_1_Glossary.html#sequence"
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><EM CLASS="term"
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>sequence</EM
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></A
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> containing <A HREF="26_1_Glossary.html#character"
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><EM CLASS="term"
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>characters</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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>string</VAR
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> — a <A HREF="26_1_Glossary.html#string_designator"
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><EM CLASS="term"
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>string designator</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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>trimmed-string</VAR
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> — a <A HREF="26_1_Glossary.html#string"
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><EM CLASS="term"
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>string</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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><A HREF="f_string-trim.html" CLASS="funref"
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><B
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>string-trim</B
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></A
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> returns a substring of <VAR CLASS="param"
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>string</VAR
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>, with all characters in <VAR CLASS="param"
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>character-bag</VAR
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> stripped off the beginning and end. <A HREF="f_string-trim.html" CLASS="funref"
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><B
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>string-left-trim</B
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></A
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> is similar but strips characters off only the beginning; <A HREF="f_string-trim.html" CLASS="funref"
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><B
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>string-right-trim</B
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></A
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> strips off only the end. </P
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><P CLASS="j"
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>If no <A HREF="26_1_Glossary.html#character"
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><EM CLASS="term"
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>characters</EM
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></A
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> need to be trimmed from the <VAR CLASS="param"
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>string</VAR
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>, then either <VAR CLASS="param"
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>string</VAR
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> itself or a copy of it may be returned, at the discretion of the implementation. </P
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><P CLASS="j"
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>All of these <A HREF="26_1_Glossary.html#function"
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><EM CLASS="term"
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>functions</EM
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></A
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> observe the <A HREF="26_1_Glossary.html#fill_pointer"
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><EM CLASS="term"
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>fill pointer</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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>Examples</B
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></DT
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><DD
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><PRE CLASS="screen"
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> (string-trim "abc" "abcaakaaakabcaaa") <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> "kaaak"
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(string-trim '(#\Space #\Tab #\Newline) " garbanzo beans
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") <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> "garbanzo beans"
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(string-trim " (*)" " ( *three (silly) words* ) ")
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<SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> "three (silly) words"
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(string-left-trim "abc" "labcabcabc") <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> "labcabcabc"
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(string-left-trim " (*)" " ( *three (silly) words* ) ")
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<SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> "three (silly) words* ) "
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(string-right-trim " (*)" " ( *three (silly) words* ) ")
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<SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> " ( *three (silly) words"</PRE
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></DD
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><DT
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><B
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>Affected By</B
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></DT
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><DD
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><P CLASS="j"
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>The <A HREF="26_1_Glossary.html#implementation"
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><EM CLASS="term"
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>implementation</EM
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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_string-upcase.html" CLASS="prev"
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>←</A
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>→</A
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><DIV CLASS="trail"
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>Conversion to HTML copyright 2023 by Gilbert Baumann</DIV
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