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<A NAME=NIL> <TITLE>NIL</TITLE></A> <b><a href=r37_idx.html>INDEX</a></b><p><p> <B>NIL</B> _ _ _ _ _ _ _ _ _ _ _ _ <B>constant</B><P> <P> <P> <P> <em>nil</em>represents the truth value false in symbolic mode, and is a synonym for 0 in algebraic mode. It cannot be used for any other purpose, even inside procedures or <A HREF=r37_0047.html>for</A> loops. <P> <P>