span class="nv">$j</span><span class="o">++</span><span class="p">)</span>
<span class="nv">$str</span>
<span class="nv">$buffer</span>
<span class="nv">$group_id</span>
<span class="nv">$last_city</span>
</pre></div>
</div>
</div>
<div class="section" id="commenting">
<h2><a class="toc-backref" href="#id9">Commenting</a><a class="headerlink" href="#commenting" title="Permalink to this headline">¶</a></h2>
<p>In general, code should be commented prolifically. It not only helps
describe the flow and intent 