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<h2>PAIRLIS$</h2>zipper together two lists
<pre>Major Section: <a href="PROGRAMMING.html">PROGRAMMING</a>
</pre><p>
The Common Lisp language allows its <code><a href="PAIRLIS.html">pairlis</a></code> function to construct
an alist in any order! So we have to define our own version,
<code>pairlis$</code>. It returns the list of pairs obtained by <code><a href="CONS.html">cons</a></code>ing
together successive respective members of the given lists until the
first list runs out. (Hence in particular, if the second argument
is <code>nil</code> then each element of the first argument is paired with <code>nil</code>.)
<p>
The <a href="GUARD.html">guard</a> for <code>pairlis$</code> requires that its arguments are true lists.
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