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<b>consider </b><font color="Maroon" title="c1">D</font> being  non <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a>  <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a> ;<br/>
<b>consider </b><font color="Maroon" title="c2">t</font> being  <a href="finset_1.html#V1" title="FINSET_1:attr.1">finite</a> <a href="bintree1.html#V2" title="BINTREE1:attr.2">binary</a> <a href="trees_2.html#NM6" title="TREES_2:NM.6">DecoratedTree</a> of <font color="Maroon" title="c1">D</font>;<br/>
<b>take </b>
<font color="Maroon" title="c2">t</font>
;<br/>

<b>thus </b><a NAME="E3:9_1_1"/>
( <font color="Maroon" title="c2">t</font> is <a href="bintree1.html#V2" title="BINTREE1:attr.2">binary</a> &amp; <font color="Maroon" title="c2">t</font> is <a href="finset_1.html#V1" title="FINSET_1:attr.1">finite</a> )
 ;<br/>


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