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<div><span class="kw">theorem </span><a NAME="T9"><span class="comment"><font color="firebrick">:: TREES_2:9</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">W</font> being   <a href="trees_1.html#NM1" title="TREES_1:NM.1">Tree</a><br/>  for <font color="Olive" title="b2">L</font> being    <a href="trees_2.html#M2" title="TREES_2:mode.2">Level</a> of <font color="Olive" title="b1">W</font> holds  <font color="Olive" title="b2">L</font> is    <a href="trees_1.html#M4" title="TREES_1:mode.4">AntiChain_of_Prefixes</a> of <font color="Olive" title="b1">W</font></div></div>
