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<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/>

<a NAME="E1:131"/>
(  <a href="finseq_2.html#K1" target="_self">idseq</a> <font color="Maroon">i</font> is    <a href="finseq_1.html#M2">FinSequence</a> of  <a href="numbers.html#K5">NAT</a>  &amp;  <a href="finseq_1.html#K3">len</a> <span class="p1">(<span class="default"><a href="finseq_2.html#K1" target="_self">idseq</a> <font color="Maroon">i</font></span>)</span> <a href="hidden.html#R1">=</a> <font color="Maroon">i</font> )
 
<b>by </b><i>, </i>;<br/>
<b>hence </b><a NAME="E2:131"/>
 <a href="finseq_2.html#K1" target="_self">idseq</a> <font color="Maroon">i</font> is    <a href="finseq_2.html#M2" target="_self">Element</a> of <font color="Maroon">i</font> <a href="finseq_2.html#K4" target="_self">-tuples_on</a> <a href="numbers.html#K5">NAT</a> 
 <b>by </b><i/>;<br/>


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