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<b>reconsider </b><font color="Maroon" title="c3">N</font> = <font color="Maroon" title="c2">M</font> as    <a href="pboole.html#M4" title="PBOOLE:mode.4">ManySortedSubset</a> of <font color="Maroon" title="c2">M</font> <b>by </b><i><a class="ref" href="pboole.html#D23" target="_self" title="PBOOLE:def.23">Def23</a></i>;<br/>
<b>take </b>
<font color="Maroon" title="c3">N</font>
;<br/>

<b>thus </b><a NAME="E2:169_1_1"/>
<font color="Maroon" title="c3">N</font> is <a href="relat_1.html#V2" title="RELAT_1:attr.2">non-empty</a>
 ;<br/>


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