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<b>let </b><font color="Maroon">c<sub>2</sub></font> be   <a href="subset_1.html#NM2">Subset</a> of <font color="Maroon">c<sub>1</sub></font>;<br/>

<a NAME="E1:26_1_1"/>
not 0 <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>2</sub></font>
 
<b>by </b><i><a class="ref" href="setfam_1.html#D9">SETFAM_1:def 9</a></i>;<br/>
<b>hence </b><a NAME="E2:26_1_1"/>
<font color="Maroon">c<sub>2</sub></font> is <a href="setfam_1.html#V1">with_non-empty_elements</a>
 <b>by </b><i><a class="ref" href="setfam_1.html#D9">SETFAM_1:def 9</a></i>;<br/>


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