e="color: #007fbf;">branch-and 
 bound</a></span></u><span style="display: none;">RH_Branch_and_Bound_algorithm</span> 
 search method.&#160;&#160;However, in this algorithm, many trees that 
 are unlikely to have a small local <a href="javascript:TextPopup(this)" id="HotSpot42820" class="glossterm">tree 
 length</a><script type="text/javascript">//<![CDATA[
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//]]></script><span class="glosstext" id="POPUP42820" style="display: none;"> Tree length is the criterion