>Pairs</span>) <span class="o">as</span> length_pairs(<span class="nv">Lists</span>, <span class="nv">Pairs</span>)
]).
</pre></div>
</div>
<p>An example of using a <a class="reference internal" href="../../glossary.html#term-parameter-variable"><span class="xref std std-term">parameter variable</span></a> in place of the module
identifier to delay to runtime the actual module to use:</p>
<div class="highlight-logtalk notranslate"><div class="highlight"><pre><span></span><span class="p">:- </span><span clas