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<b>let </b><font color="Maroon">c<sub>3</sub></font> be  non <a href="xboole_0.html#V1">empty</a>  <a href="hidden.html#M1">set</a> ;<br/>

<b>thus </b><a NAME="E1:61_1_1"/>
not <font color="Maroon">c<sub>3</sub></font> <a href="subset_1.html#R1" target="_self">misses</a> <font color="Maroon">c<sub>3</sub></font>
 ;<br/>


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