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<a NAME="E1:49_1_1"/>
 <a href="pboole.html#K1">[0]</a> <font color="Maroon">c<sub>1</sub></font> <a href="pboole.html#R2">c=</a>  <a href="mssubfam.html#K3" target="_self">bool</a> <font color="Maroon">c<sub>2</sub></font>
 
<b>by </b><i><a class="ref" href="pboole.html#T49">PBOOLE:49</a></i>;<br/>
<a NAME="E2:49_1_1"/><b>then </b>
 <a href="pboole.html#K1">[0]</a> <font color="Maroon">c<sub>1</sub></font> is    <a href="pboole.html#M4">ManySortedSubset</a> of  <a href="mssubfam.html#K3" target="_self">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="E3:49_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 <br/>( <font color="Olive">b<sub>1</sub></font> is <a href="relat_1.html#V3">empty-yielding</a> &amp; <font color="Olive">b<sub>1</sub></font> is <a href="pre_circ.html#V1">locally-finite</a> )
 ;<br/>


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