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  <section id="structural-elements">
<h1><a class="toc-backref" href="#id4"><span class="section-number">1. </span>Structural Elements</a><a class="headerlink" href="#structural-elements" title="Permalink to this headline">¶</a></h1>
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<p class="topic-title">Table of Contents</p>
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<li><p><a class="reference internal" href="#structural-elements" id="id4">Structural 