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<b>let </b><font color="Maroon">T</font> be  non <a href="struct_0.html#V3">empty</a>  <a href="struct_0.html#L1">1-sorted</a> ;<br/><b>let </b><font color="Maroon">A</font> be  <a href="funct_1.html#V3">V9</a> <a href="kurato_2.html#NM1">SetSequence</a> of <font color="Maroon">T</font>;<br/><b>let </b><font color="Maroon">B</font> be    <a href="kurato_2.html#M1" target="_self">subsequence</a> of <font color="Maroon">A</font>;<br/>





<b>consider </b><font color="Maroon">X</font> being   <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">T</font><b> such that </b><br/><a NAME="E2:63"/><i><font color="Green">E43</font></i>: 
for <font color="Olive">n</font> being   <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a>  holds  <font color="Maroon">A</font> <a href="kurato_2.html#K7" target="_self">.</a> <font color="Olive">n</font> <a href="hidden.html#R1">=</a> <font color="Maroon">X</font>
 <b>by </b><i/>;<br/>
<b>thus </b><a NAME="E3:63"/>
<font color="Maroon">A</font> <a href="funct_2.html#R2">=</a> <font color="Maroon">B</font>
 <b>by </b><i>, </i>;<br/>


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