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<b>consider </b><font color="Maroon">D</font> being  non <a href="xboole_0.html#V1">empty</a>  <a href="hidden.html#M1">set</a> ;<br/>
<b>consider </b><font color="Maroon">t</font> being  <a href="finset_1.html#V1">finite</a> <a href="bintree1.html#V2" target="_self">binary</a> <a href="trees_2.html#NM6">DecoratedTree</a> of <font color="Maroon">D</font>;<br/>
<b>take </b>
<font color="Maroon">t</font>
;<br/>

<b>thus </b><a NAME="E3:9_1_1"/>
( <font color="Maroon">t</font> is <a href="bintree1.html#V2" target="_self">binary</a> &amp; <font color="Maroon">t</font> is <a href="finset_1.html#V1">finite</a> )
 ;<br/>


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