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<b>let </b><font color="Maroon" title="c4">x</font> be    <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a> ;<br/>

<b>assume </b><a NAME="E1:14_1_1"/>
<font color="Maroon" title="c4">x</font> is    <a href="closure2.html#M1" title="CLOSURE2:mode.1">Element</a> of <font color="Maroon" title="c3">B</font>
 ;<br/>

<b>hence </b><a NAME="E2:14_1_1"/>
<font color="Maroon" title="c4">x</font> is    <a href="pboole.html#M1" title="PBOOLE:mode.1">ManySortedSet</a> of <font color="Maroon" title="c1">I</font>
 ;<br/>


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