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<b>thus </b><a NAME="E1:18_1_1"/>
<font color="Maroon">c<sub>2</sub></font> <a href="pboole.html#K3">/\</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>1</sub></font> <a href="msafree3.html#K2" target="_self">variables_in</a> <font color="Maroon">c<sub>3</sub></font></span>)</span> <a href="pboole.html#R2">c=</a> <font color="Maroon">c<sub>2</sub></font>
 <b>by </b><i><a class="ref" href="pboole.html#T17">PBOOLE:17</a></i>; <i><font color="Red">:: according to </font></i><a class="ref" href="pboole.html#D23">PBOOLE:def 23</a><br/>


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