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<a NAME="E1:51_1_1"/>
 <a href="mssubfam.html#K3" target="_self">bool</a> <font color="Maroon">M</font> is   <a href="mssubfam.html#NM1">MSSubsetFamily</a> of <font color="Maroon">M</font>
 
;<br/>
<b>hence </b><a NAME="E2:51_1_1"/>
 ex <font color="Olive">b<sub>1</sub></font> being  <a href="mssubfam.html#NM1">MSSubsetFamily</a> of <font color="Maroon">M</font> st <br/>( <font color="Olive">b<sub>1</sub></font> is <a href="relat_1.html#V2">non-empty</a> &amp; <font color="Olive">b<sub>1</sub></font> is <a href="finset_1.html#V2">locally-finite</a> )
 ;<br/>


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