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<b>let </b><font color="Maroon">f</font> be  non <a href="funct_1.html#V3">constant</a> <a href="goboard5.html#V2">standard</a> <a href="goboard5.html#NM1">special_circular_sequence</a>;<br/><b>let </b><font color="Maroon">i</font> be    <a href="subset_1.html#M1">Element</a> of  <a href="numbers.html#K5">NAT</a> ;<br/><b>let </b><font color="Maroon">j</font> be    <a href="subset_1.html#M1">Element</a> of  <a href="numbers.html#K5">NAT</a> ;<br/>





<a NAME="E1:16"/>
(  <a href="finseq_1.html#K3">len</a> <span class="p1">(<span class="default"><a href="goboard9.html#K1" target="_self">Rev</a> <font color="Maroon">f</font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="finseq_1.html#K3">len</a> <font color="Maroon">f</font> &amp;  <a href="goboard9.html#K1" target="_self">Rev</a> <span class="p1">(<span class="default"><a href="goboard9.html#K1" target="_self">Rev</a> <font color="Maroon">f</font></span>)</span> <a href="hidden.html#R1">=</a> <font color="Maroon">f</font> )
 
<b>by </b><i><a class="ref" href="finseq_5.html#D3">FINSEQ_5:def 3</a>, <a class="ref" href="finseq_6.html#T29">FINSEQ_6:29</a></i>;<br/>
<b>hence </b><a NAME="E2:16"/>
( <font color="Maroon">i</font> <a href="xxreal_0.html#NR2" target="_self">&gt;=</a> 1 &amp; <font color="Maroon">j</font> <a href="xxreal_0.html#NR2" target="_self">&gt;=</a> 1 &amp; <font color="Maroon">i</font> <a href="nat_1.html#K1">+</a> <font color="Maroon">j</font> <a href="hidden.html#R1">=</a>  <a href="finseq_1.html#K3">len</a> <font color="Maroon">f</font> implies  <a href="goboard5.html#K5">left_cell</a> <span class="p1">(<span class="default"><a href="goboard9.html#K1" target="_self">Rev</a> <font color="Maroon">f</font></span>)</span>,<font color="Maroon">i</font> <a href="hidden.html#R1">=</a>  <a href="goboard5.html#K4">right_cell</a> <font color="Maroon">f</font>,<font color="Maroon">j</font> )
 <b>by </b><i/>;<br/>


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