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<b>consider </b><font color="Maroon">c<sub>2</sub></font> being    <a href="subset_1.html#M2">Element</a> of <font color="Maroon">c<sub>1</sub></font>;<br/>
<a NAME="E2:30_1_1"/>
 <a href="supinf_2.html#K3" target="_self">-</a> <font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#R1">=</a>  <a href="supinf_2.html#K3" target="_self">-</a> <font color="Maroon">c<sub>2</sub></font>
 
;<br/>
<b>hence </b><a NAME="E3:30_1_1"/>
not  <a href="supinf_2.html#K6" target="_self">-</a> <font color="Maroon">c<sub>1</sub></font> is <a href="xboole_0.html#V1">empty</a>
 <b>by </b><i><a class="ref" href="supinf_2.html#D6" target="_self">Def6</a></i>;<br/>


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