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<a NAME="E1:6_1"/>
 ex <font color="Olive">a</font> being   <a href="subset_1.html#M1">Element</a> of <font color="Maroon">F<sub>1</sub></font>() st <br/>( <font color="Maroon">F<sub>2</sub></font>() <a href="hidden.html#R1">=</a> <font color="Olive">a</font> &amp; <font color="Maroon">P<sub>1</sub></font>[<font color="Olive">a</font>] )
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E2:6_1"/>
<font color="Maroon">P<sub>1</sub></font>[<font color="Maroon">F<sub>2</sub></font>()]
 ;<br/>


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