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<b>reconsider </b><font color="Maroon">T</font> = <span class="p1"><a href="tarski.html#K1">{</a><span class="default"><a href="xboole_0.html#K1">{}</a> </span><a href="tarski.html#K1">}</a></span> as   <a href="trees_1.html#NM1">Tree</a> <b>by </b><i><a class="ref" href="trees_1.html#T48">TREES_1:48</a></i>;<br/>
<b>take </b>
<font color="Maroon">T</font>
;<br/>

<b>take </b>
0
; <i><font color="Red">:: according to </font></i><a class="ref" href="trees_2.html#D2" target="_self">TREES_2:def 2</a><br/>

<b>let </b><font color="Maroon">t</font> be    <a href="trees_1.html#M1">Element</a> of <font color="Maroon">T</font>;<br/>

<b>thus </b><a NAME="E2:13_1_1"/>
not <font color="Maroon">t</font> <a href="finseq_1.html#K8">^</a> <span class="p1"><a href="finseq_1.html#K12">&lt;*</a><span class="default">0</span><a href="finseq_1.html#K12">*&gt;</a></span> <a href="hidden.html#R2">in</a> <font color="Maroon">T</font>
 <b>by </b><i><a class="ref" href="tarski.html#D1">TARSKI:def 1</a></i>;<br/>


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