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<b>let </b><font color="Maroon">S</font> be  non <a href="msualg_1.html#V2">void</a> <a href="catalg_1.html#NM1">Signature</a>;<br/><b>let </b><font color="Maroon">X</font> be  <a href="relat_1.html#V2">V3</a>  <a href="pboole.html#M1">ManySortedSet</a> of the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">S</font>;<br/><b>let </b><font color="Maroon">t</font> be   <a href="msaterm.html#NM1">Term</a> of <font color="Maroon">S</font>,<font color="Maroon">X</font>;<br/>





<a NAME="E1:26"/>
<font color="Maroon">S</font> <a href="msafree3.html#K2" target="_self">variables_in</a> <font color="Maroon">t</font> <a href="pboole.html#R2">c=</a> <font color="Maroon">X</font>
 
<b>by </b><i/>;<br/>
<a NAME="E2:26"/><b>then </b>
<font color="Maroon">X</font> <a href="pboole.html#K3">/\</a> <span class="p1">(<span class="default"><font color="Maroon">S</font> <a href="msafree3.html#K2" target="_self">variables_in</a> <font color="Maroon">t</font></span>)</span> <a href="pboole.html#R6">=</a> <font color="Maroon">S</font> <a href="msafree3.html#K2" target="_self">variables_in</a> <font color="Maroon">t</font>
 
<b>by </b><i><a class="ref" href="pboole.html#T25">PBOOLE:25</a></i>;<br/>
<a NAME="E3:26"/><b>then </b>
<font color="Maroon">S</font> <a href="msafree3.html#K2" target="_self">variables_in</a> <font color="Maroon">t</font> <a href="pboole.html#R6">=</a> <font color="Maroon">X</font> <a href="msafree3.html#K3" target="_self">variables_in</a> <font color="Maroon">t</font>
 
;<br/>
<b>hence </b><a NAME="E4:26"/>
 <a href="msafree3.html#K4" target="_self">variables_in</a> <font color="Maroon">t</font> <a href="pboole.html#R6">=</a> <font color="Maroon">X</font> <a href="msafree3.html#K3" target="_self">variables_in</a> <font color="Maroon">t</font>
 ;<br/>


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