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<b>let </b><font color="Maroon">t1</font> be   <a href="trees_2.html#NM4">DecoratedTree</a>;<br/><b>let </b><font color="Maroon">t2</font> be   <a href="trees_2.html#NM4">DecoratedTree</a>;<br/>



<b>assume </b><a NAME="E1:46"/>
 <a href="trees_9.html#K6" target="_self">FixedSubtrees</a> <font color="Maroon">t1</font> <a href="hidden.html#R1">=</a>  <a href="trees_9.html#K6" target="_self">FixedSubtrees</a> <font color="Maroon">t2</font>
 ;<br/>

<a NAME="E2:46"/><b>then </b>
<span class="p1"><a href="tarski.html#K4">[</a><span class="default"><a href="xboole_0.html#K1">{}</a> ,<font color="Maroon">t1</font></span><a href="tarski.html#K4">]</a></span> <a href="hidden.html#R2">in</a>  <a href="trees_9.html#K6" target="_self">FixedSubtrees</a> <font color="Maroon">t2</font>
 
<b>by </b><i><a class="txt" href="trees_9.html#E4:46"><i><font color="Green">E22</font></i></a></i>;<br/>
<b>then consider </b><font color="Maroon">n</font> being   <a href="trees_4.html#NM1">Node</a> of <font color="Maroon">t2</font><b> such that </b><br/><a NAME="E4:46"/><i><font color="Green">E22</font></i>: 
<span class="p1"><a href="tarski.html#K4">[</a><span class="default"><a href="xboole_0.html#K1">{}</a> ,<font color="Maroon">t1</font></span><a href="tarski.html#K4">]</a></span> <a href="hidden.html#R1">=</a> <span class="p1"><a href="tarski.html#K4">[</a><span class="default"><font color="Maroon">n</font>,<span class="p2">(<span class="default"><font color="Maroon">t2</font> <a href="trees_2.html#K5">|</a> <font color="Maroon">n</font></span>)</span></span><a href="tarski.html#K4">]</a></span>
 ;<br/>
<a NAME="E5:46"/>
(  <a href="xboole_0.html#K1">{}</a>  <a href="hidden.html#R1">=</a> <font color="Maroon">n</font> &amp; <font color="Maroon">t1</font> <a href="hidden.html#R1">=</a> <font color="Maroon">t2</font> <a href="trees_2.html#K5">|</a> <font color="Maroon">n</font> )
 
<b>by </b><i>, <a class="ref" href="zfmisc_1.html#T33">ZFMISC_1:33</a></i>;<br/>
<b>hence </b><a NAME="E6:46"/>
<font color="Maroon">t1</font> <a href="hidden.html#R1">=</a> <font color="Maroon">t2</font>
 <b>by </b><i/>;<br/>


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