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<b>reconsider </b><font color="Maroon">X</font> = <font color="Maroon">M</font> as    <a href="pboole.html#M4">ManySortedSubset</a> of <font color="Maroon">M</font> <b>by </b><i><a class="ref" href="pboole.html#D23">PBOOLE:def 23</a></i>;<br/>
<b>take </b>
<font color="Maroon">X</font>
;<br/>

<b>thus </b><a NAME="E2:3_1_1"/>
<font color="Maroon">X</font> is   <a href="osalg_1.html#NM4">OrderSortedSet</a> of <font color="Maroon">R</font>
 ;<br/>


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