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<B><FONT COLOR="#A020F0">proc</FONT></B> <B><FONT COLOR="#0000FF">fac</FONT></B> {<FONT COLOR="#B8860B">x</FONT>} {
    <B><FONT COLOR="#A020F0">if</FONT></B> { $<FONT COLOR="#B8860B">x</FONT> &lt;= 1 } { <B><FONT COLOR="#A020F0">return</FONT></B> 1 }
    <B><FONT COLOR="#A020F0">expr</FONT></B> { $<FONT COLOR="#B8860B">x</FONT> * [fac [<B><FONT COLOR="#A020F0">expr</FONT></B> $<FONT COLOR="#B8860B">x</FONT> - 1]] }
}
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