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<b>take </b><font color="Maroon">t</font> =  <a href="trees_4.html#K2">root-tree</a> 0;<br/>

<b>thus </b><a NAME="E1:15_1_1"/>
 <a href="relat_1.html#K1">dom</a> <font color="Maroon">t</font> <a href="hidden.html#R1">=</a>  <a href="trees_1.html#K2">elementary_tree</a> 0
 <b>by </b><i><a class="ref" href="trees_4.html#T3">TREES_4:3</a></i>; <i><font color="Red">:: according to </font></i><a class="ref" href="trees_9.html#D1" target="_self">TREES_9:def 1</a><br/>


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