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<b>let </b><font color="Maroon">X</font> be    <a href="hidden.html#M1">set</a> ;<br/>

<b>assume </b><a NAME="E1:29_1_1"/>
<font color="Maroon">X</font> is <a href="trees_3.html#V2" target="_self">constituted-FinTrees</a>
 ;<br/>

<b>hence </b><a NAME="E2:29_1_1"/>
for <font color="Olive">x</font> being   <a href="hidden.html#M1">set</a>   st <font color="Olive">x</font> <a href="hidden.html#R2">in</a> <font color="Maroon">X</font> holds <br/><font color="Olive">x</font> is   <a href="trees_1.html#NM1">Tree</a>
 <b>by </b><i/>; <i><font color="Red">:: according to </font></i><a class="ref" href="trees_3.html#D3" target="_self">TREES_3:def 3</a><br/>


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