use this to sort the priority que when combining equivalent costly groups</div>
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<dt><span class="returnLabel">Returns:</span></dt>
<dd>The average of the indexes.</dd>
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<h4>hashCode</h4>
<pre class="methodSignature">public&nbsp;int&nbsp;hashCode()</pre>
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<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="IColIndex.html#hashCode()">hashCode</a></code>&nbsp;in interface&