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<b>assume </b><a NAME="E1:50_10_1"/>
 <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a>  <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a> <span class="p1"><a href="enumset1.html#K8" title="ENUMSET1:func.8">{</a><span class="default"><font color="Maroon" title="c1">A</font>,<font color="Maroon" title="c2">B</font>,<font color="Maroon" title="c3">C</font>,<font color="Maroon" title="c4">D</font>,<font color="Maroon" title="c5">E</font>,<font color="Maroon" title="c6">F</font>,<font color="Maroon" title="c7">G</font>,<font color="Maroon" title="c8">H</font>,<font color="Maroon" title="c9">I</font>,<font color="Maroon" title="c10">J</font></span><a href="enumset1.html#K8" title="ENUMSET1:func.8">}</a></span>
 ; <i><font color="Red">:: according to </font></i><a class="ref" href="setfam_1.html#D9" target="_self" title="SETFAM_1:def.9">SETFAM_1:def 9</a><br/>

<b>hence </b><a NAME="E2:50_10_1"/>
contradiction
 <b>by </b><i><a class="ref" href="enumset1.html#D8" title="ENUMSET1:def.8">ENUMSET1:def 8</a></i>;<br/>


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