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<b>let </b><font color="Maroon">x</font> be    <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">E</font> be    <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">A</font> be   <a href="subset_1.html#NM2">Subset</a> of <font color="Maroon">E</font>;<br/>





<b>assume </b><a NAME="E1:65"/>
<font color="Maroon">x</font> <a href="hidden.html#R2">in</a> <font color="Maroon">A</font>
 ;<br/>

<a NAME="E2:65"/><b>then </b>
<font color="Maroon">x</font> <a href="hidden.html#R2">in</a> <font color="Maroon">E</font>
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E3:65"/>
<font color="Maroon">x</font> is    <a href="subset_1.html#M1" target="_self">Element</a> of <font color="Maroon">E</font>
 <b>by </b><i/>;<br/>


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