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<b>consider </b><font color="Maroon">c<sub>2</sub></font> being  non <a href="tex_2.html#V1" target="_self">proper</a> <a href="subset_1.html#NM2">Subset</a> of <font color="Maroon">c<sub>1</sub></font>;<br/>
<b>take </b>
<font color="Maroon">c<sub>2</sub></font>
;<br/>

<b>thus </b><a NAME="E2:11_2_1"/>
not <font color="Maroon">c<sub>2</sub></font> is <a href="tex_2.html#V1" target="_self">proper</a>
 ;<br/>


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