s on which 
 the tree is (or is to be) built.</dd>
<dt><span class="strong">Returns:</span></dt><dd>The centre/pivot of the node.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.Exception</code> - If there is some problem calculating
 the pivot.</dd></dl>
</li>
</ul>
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