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<b>take </b>
 <a href="xboole_0.html#K1">{}</a> 
;<br/>

<b>thus </b><a NAME="E1:12_1_1"/>
for <font color="Olive">a</font> being  <a href="finseq_1.html#NM1">FinSequence</a>  st <font color="Olive">a</font> <a href="hidden.html#R2">in</a>  <a href="xboole_0.html#K1">{}</a>  holds <br/> <a href="finseq_1.html#K3">len</a> <font color="Olive">a</font> <a href="hidden.html#R1">=</a> <font color="Maroon">k</font>
 ;<br/>


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