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<a NAME="E1:75_1_1"/>
<font color="Maroon" title="c1">X</font> <a href="tarski.html#R1" title="TARSKI:pred.1">c=</a>  <a href="pscomp_1.html#K6" title="PSCOMP_1:func.6">Cl</a> <font color="Maroon" title="c1">X</font>
 
<b>by </b><i><a class="ref" href="pscomp_1.html#T33" title="PSCOMP_1:th.33">PSCOMP_1:33</a></i>;<br/>
<b>hence </b><a NAME="E2:75_1_1"/>
not  <a href="pscomp_1.html#K6" title="PSCOMP_1:func.6">Cl</a> <font color="Maroon" title="c1">X</font> is <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a>
 <b>by </b><i><a class="ref" href="xboole_1.html#T3" title="XBOOLE_1:th.3">XBOOLE_1:3</a></i>;<br/>


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