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<b>let </b><font color="Maroon">c<sub>1</sub></font> be    <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">c<sub>2</sub></font>, <font color="Maroon">c<sub>3</sub></font> be    <a href="pboole.html#M1">ManySortedSet</a> of <font color="Maroon">c<sub>1</sub></font>;<br/><b>let </b><font color="Maroon">c<sub>4</sub></font> be   <a href="closure2.html#NM1">SubsetFamily</a> of <font color="Maroon">c<sub>2</sub></font>;<br/>





<b>assume </b><a NAME="E1:3"/>
<font color="Maroon">c<sub>3</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>4</sub></font>
 ;<br/>

<a NAME="E2:3"/><b>then </b>
<font color="Maroon">c<sub>3</sub></font> <a href="pboole.html#R1">in</a> <span class="p1"><a href="closure2.html#K5">|:</a><span class="default"><font color="Maroon">c<sub>4</sub></font></span><a href="closure2.html#K5">:|</a></span>
 
<b>by </b><i><a class="ref" href="closure2.html#T22">CLOSURE2:22</a></i>;<br/>
<b>hence </b><a NAME="E3:3"/>
 <a href="mssubfam.html#K6">meet</a> <span class="p1"><a href="closure2.html#K5">|:</a><span class="default"><font color="Maroon">c<sub>4</sub></font></span><a href="closure2.html#K5">:|</a></span> <a href="closure2.html#NR2" target="_self">c='</a> <font color="Maroon">c<sub>3</sub></font>
 <b>by </b><i><a class="ref" href="mssubfam.html#T43">MSSUBFAM:43</a></i>;<br/>


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