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<a NAME="E1:19_1_1"/>
the <a href="msualg_1.html#U4">Sorts</a> of <font color="Maroon">c<sub>2</sub></font> is    <a href="msafree.html#M1">GeneratorSet</a> of <font color="Maroon">c<sub>2</sub></font>
 
<b>by </b><i><a class="ref" href="msafree2.html#T9">MSAFREE2:9</a></i>;<br/>
<b>then consider </b><font color="Maroon">c<sub>3</sub></font> being    <a href="msafree.html#M1">GeneratorSet</a> of <font color="Maroon">c<sub>2</sub></font><b> such that </b><br/><a NAME="E3:19_1_1"/><i><font color="Green">E7</font></i>: 
<font color="Maroon">c<sub>3</sub></font> <a href="pboole.html#R6">=</a> the <a href="msualg_1.html#U4">Sorts</a> of <font color="Maroon">c<sub>2</sub></font>
 ;<br/>
<b>take </b>
<font color="Maroon">c<sub>3</sub></font>
;<br/>

<b>thus </b><a NAME="E4:19_1_1"/>
<font color="Maroon">c<sub>3</sub></font> is <a href="relat_1.html#V2">non-empty</a>
 <b>by </b><i><a class="txt" href="extens_1.html#E3:19_1_1"><i><font color="Green">E7</font></i></a></i>;<br/>


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