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<b>let </b><font color="Maroon">Y</font> be   <a href="subset_1.html#NM2">Subset</a> of <font color="Maroon">X</font>;<br/><b>let </b><font color="Maroon">x</font> be    <a href="hidden.html#M1">set</a> ; <i><font color="Red">:: according to </font></i><a class="ref" href="trees_3.html#D4" target="_self">TREES_3:def 4</a><br/>



<b>thus </b><a NAME="E1:31_1_1"/>
( <font color="Maroon">x</font> <a href="hidden.html#R2">in</a> <font color="Maroon">Y</font> implies <font color="Maroon">x</font> is  <a href="finset_1.html#V1">finite</a> <a href="trees_1.html#NM1">Tree</a> )
 <b>by </b><i/>;<br/>


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