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<b>assume </b><a NAME="E1:48_4_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#K2" title="ENUMSET1:func.2">{</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></span><a href="enumset1.html#K2" title="ENUMSET1:func.2">}</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="E2:48_4_1"/>
contradiction
 <b>by </b><i><a class="ref" href="enumset1.html#D2" title="ENUMSET1:def.2">ENUMSET1:def 2</a></i>;<br/>


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