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<b>consider </b><font color="Maroon" title="c1">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 <span class="p1"><a href="tarski.html#K1" title="TARSKI:func.1">{</a><span class="default"><a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a> </span><a href="tarski.html#K1" title="TARSKI:func.1">}</a></span>;<br/>
<b>take </b>
<font color="Maroon" title="c1">t</font>
; <a class="txt" onclick="hs(this)" href="javascript:()"><i><font color="Red">::  thesis: </font></i></a><span class="hide"> ( <font color="Maroon" title="c1">t</font> is <a href="bintree1.html#V2" title="BINTREE1:attr.2">binary</a> &amp; <font color="Maroon" title="c1">t</font> is <a href="finset_1.html#V1" title="FINSET_1:attr.1">finite</a> )</span><br/>

<b>thus </b><a NAME="E2:9_1_1"/>
( <font color="Maroon" title="c1">t</font> is <a href="bintree1.html#V2" title="BINTREE1:attr.2">binary</a> &amp; <font color="Maroon" title="c1">t</font> is <a href="finset_1.html#V1" title="FINSET_1:attr.1">finite</a> )
 ; <a class="txt" onclick="hs(this)" href="javascript:()"><i><font color="Red">::  thesis: </font></i></a><span class="hide"> verum</span><br/>


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