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<b>consider </b><font color="Maroon">c<sub>1</sub></font> being   <a href="topreal2.html#NM1">Simple_closed_curve</a>;<br/>
<b>take </b>
<font color="Maroon">c<sub>1</sub></font>
;<br/>

<b>thus </b><a NAME="E2:18_1_1"/>
not <font color="Maroon">c<sub>1</sub></font> is <a href="xboole_0.html#V1">empty</a>
 ;<br/>


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