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<h2>ADD-TO-SET-EQ</h2>add a symbol to a list
<pre>Major Section: <a href="PROGRAMMING.html">PROGRAMMING</a>
</pre><p>
For a symbol <code>x</code> and a true list <code>lst</code>, <code>(add-to-set-eq x lst)</code>
is the result of <code><a href="CONS.html">cons</a></code>ing <code>x</code> on to the front of <code>lst</code>, unless
<code>x</code> is already a member of <code>lst</code>, in which case it equals <code>lst</code>.
<p>
<code>(add-to-set-eq x lst)</code> has a <a href="GUARD.html">guard</a> that <code>lst</code> is a true list and
moreover, either <code>x</code> is a symbol or <code>lst</code> is a list of symbols.
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