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<b>let </b><font color="Maroon">t1</font> be   <a href="finseq_1.html#NM1">FinSequence</a>, <font color="Maroon">t2</font> be   <a href="finseq_1.html#NM1">FinSequence</a>;<br/>

<b>assume </b><a NAME="E1:3"/><i><font color="Green">E30</font></i>: 
 <a href="finseq_5.html#K3">Rev</a> <font color="Maroon">t1</font> <a href="hidden.html#R1">=</a>  <a href="finseq_5.html#K3">Rev</a> <font color="Maroon">t2</font>
 ;<br/>

<b>thus </b><font color="Maroon">t1</font> = 
 <a href="finseq_5.html#K3">Rev</a> <span class="p1">(<span class="default"><a href="finseq_5.html#K3">Rev</a> <font color="Maroon">t1</font></span>)</span>
<b>by </b><i><a class="ref" href="finseq_6.html#T29">FINSEQ_6:29</a></i>
<br/>.= 
<font color="Maroon">t2</font>
<b>by </b><i>, <a class="ref" href="finseq_6.html#T29">FINSEQ_6:29</a></i>
;<br/>


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