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<b>assume </b><a NAME="E1:50_7_1"/>
 <a href="xboole_0.html#K1">{}</a>  <a href="hidden.html#R2">in</a> <span class="p1"><a href="enumset1.html#K5">{</a><span class="default"><font color="Maroon">A</font>,<font color="Maroon">B</font>,<font color="Maroon">C</font>,<font color="Maroon">D</font>,<font color="Maroon">E</font>,<font color="Maroon">F</font>,<font color="Maroon">G</font></span><a href="enumset1.html#K5">}</a></span>
 ; <i><font color="Red">:: according to </font></i><a class="ref" href="setfam_1.html#D9" target="_self">SETFAM_1:def 9</a><br/>

<b>hence </b><a NAME="E2:50_7_1"/>
contradiction
 <b>by </b><i><a class="ref" href="enumset1.html#D5">ENUMSET1:def 5</a></i>;<br/>


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