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<b>let </b><font color="Maroon">x</font> be    <a href="subset_1.html#M2">Element</a> of <font color="Maroon">N</font>;<br/>

<b>thus </b><a NAME="E1:25_1_1"/>
<font color="Maroon">x</font> is    <a href="subset_1.html#M2">Element</a> of <font color="Maroon">S</font>
 ;<br/>


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