><span class="lineno">  257</span>&#160;        </div>
<div class="line"><a name="l00258"></a><span class="lineno">  258</span>&#160;        call this.counts.clear()</div>
<div class="line"><a name="l00259"></a><span class="lineno">  259</span>&#160;        call this.density.clear()</div>
<div class="line"><a name="l00260"></a><span class="lineno">  260</span>&#160;        </div>
<div class="line"><a name="l00261"></a><span class="lineno">  261</span>&#160;        iter =&gt; this.begin</div>
<div class="lin