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<a NAME="E1:18_1_1"/>
the <a href="msualg_1.html#U4" title="MSUALG_1:sel.4">Sorts</a> of <font color="Maroon" title="c2">U1</font> is    <a href="msafree.html#M1" title="MSAFREE:mode.1">GeneratorSet</a> of <font color="Maroon" title="c2">U1</font>
 
<b>by </b><i><a class="ref" href="msafree2.html#T9" title="MSAFREE2:th.9">MSAFREE2:9</a></i>;<br/>
<b>then consider </b><font color="Maroon" title="c3">G</font> being    <a href="msafree.html#M1" title="MSAFREE:mode.1">GeneratorSet</a> of <font color="Maroon" title="c2">U1</font><b> such that </b><br/><a NAME="E3:18_1_1"/><i><font color="Green" title="E6">A1</font></i>: 
<font color="Maroon" title="c3">G</font> <a href="pboole.html#R6" title="PBOOLE:pred.6">=</a> the <a href="msualg_1.html#U4" title="MSUALG_1:sel.4">Sorts</a> of <font color="Maroon" title="c2">U1</font>
 ;<br/>
<b>take </b>
<font color="Maroon" title="c3">G</font>
;<br/>

<b>thus </b><a NAME="E4:18_1_1"/>
<font color="Maroon" title="c3">G</font> is <a href="relat_1.html#V2" title="RELAT_1:attr.2">non-empty</a>
 <b>by </b><i><a class="txt" href="extens_1.html#E3:18_1_1"><i><font color="Green" title="E6">A1</font></i></a></i>;<br/>


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