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<b>let </b><font color="Maroon">c<sub>4</sub></font> be    <a href="hidden.html#M1">set</a> ;<br/>

<b>assume </b><a NAME="E1:14_1_1"/>
<font color="Maroon">c<sub>4</sub></font> is    <a href="closure2.html#M1">Element</a> of <font color="Maroon">c<sub>3</sub></font>
 ;<br/>

<b>hence </b><a NAME="E2:14_1_1"/>
<font color="Maroon">c<sub>4</sub></font> is    <a href="pboole.html#M1">ManySortedSet</a> of <font color="Maroon">c<sub>1</sub></font>
 ;<br/>


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