code></a></p></li>
</ul>
</li>
<li><p><a class="reference internal" href="#protected-predicates" id="id16">Protected predicates</a></p></li>
<li><p><a class="reference internal" href="#private-predicates" id="id17">Private predicates</a></p>
<ul>
<li><p><a class="reference internal" href="#merge-options-2" id="id18"><code class="docutils literal notranslate"><span class="pre">merge_options/2</span></code></a></p></li>
<li><p><a class="reference internal" href="#predicate-called-but-not-defined-2" id="id19">