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<b>let </b><font color="Maroon">I</font> be    <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">M</font> be    <a href="pboole.html#M1">ManySortedSet</a> of <font color="Maroon">I</font>;<br/>



<a NAME="E1:50"/>
 <a href="pboole.html#K1">[0]</a> <font color="Maroon">I</font> <a href="pboole.html#R2">c=</a>  <a href="mssubfam.html#K3" target="_self">bool</a> <font color="Maroon">M</font>
 
<b>by </b><i><a class="ref" href="pboole.html#T49">PBOOLE:49</a></i>;<br/>
<b>hence </b><a NAME="E2:50"/>
 <a href="pboole.html#K1">[0]</a> <font color="Maroon">I</font> is  <a href="relat_1.html#V3">V6</a> <a href="finset_1.html#V2">V21</a> <a href="mssubfam.html#NM1">MSSubsetFamily</a> of <font color="Maroon">M</font>
 <b>by </b><i><a class="ref" href="pboole.html#D23">PBOOLE:def 23</a></i>;<br/>


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