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 <a href="mboolean.html#K1">bool</a> <font color="Maroon">c<sub>2</sub></font> is    <a href="pboole.html#M4">ManySortedSubset</a> of  <a href="mboolean.html#K1">bool</a> <font color="Maroon">c<sub>2</sub></font>
 
<b>by </b><i><a class="ref" href="pboole.html#D23">PBOOLE:def 23</a></i>;<br/>
<b>hence </b><a NAME="E2:47_1_1"/>
ex <font color="Olive">b<sub>1</sub></font> being  <a href="mssubfam.html#NM1">MSSubsetFamily</a> of <font color="Maroon">c<sub>2</sub></font> st <font color="Olive">b<sub>1</sub></font> is <a href="relat_1.html#V2">non-empty</a>
 ;<br/>


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