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<b>let </b><font color="Maroon">a</font> be    <a href="hidden.html#M1">set</a> ;<br/>

<a NAME="E1:14_1"/>
<font color="Maroon">P<sub>1</sub></font>[<font color="Maroon">a</font>,<font color="Maroon">a</font>]
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E2:14_1"/>
 ex <font color="Olive">b</font> being   <a href="hidden.html#M1">set</a>  st <font color="Maroon">P<sub>1</sub></font>[<font color="Olive">b</font>,<font color="Maroon">a</font>]
 ;<br/>


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