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<a name="Distribute-1"></a>
<h4 class="subsubsection">2.7.14.3 Distribute</h4>

<p>The function with the following virtual code representation is
frequently useful for manipulating lists.
<a name="index-distribute"></a>
</p>
<dl compact="compact">
<dt> <em>T30</em></dt>
<dd><p><code>distribute</code> = <code>(((nil,nil),nil),nil)</code>
</p></dd>
</dl>

<p>This function takes a pair whose right side represents a list, and
returns a list of pairs, with one pair for each item in the list. The
left side of each pair is the left side of the original argument, and
the right side is the corresponding item of the list. A semantics for
this operation is specified by the following properties.
</p>
<dl compact="compact">
<dt> <em>P39</em></dt>
<dd><p>[[<code>distribute</code>]] <code>(<var>x</var>,nil)</code> = <code>nil</code>
</p></dd>
<dt> <em>P40</em></dt>
<dd><p>[[<code>distribute</code>]] <code>(<var>x</var>,(<var>y</var>,<var>z</var>))</code> =
<code>((<var>x</var>,<var>y</var>),</code>[[<code>distribute</code>]] <code>(<var>x</var>,<var>z</var>))</code>
</p></dd>
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