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<b>consider </b><font color="Maroon" title="c1">A</font> being   <a href="topreal2.html#NM1" title="TOPREAL2:NM.1">Simple_closed_curve</a>;<br/>
<b>take </b>
<font color="Maroon" title="c1">A</font>
;<br/>

<b>thus </b><a NAME="E2:18_1_1"/>
not <font color="Maroon" title="c1">A</font> is <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a>
 ;<br/>


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