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<b>let </b><font color="Maroon" title="c1">I</font> be  non <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a>  <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a> ;<br/><b>let </b><font color="Maroon" title="c2">x</font>, <font color="Maroon" title="c3">X</font>, <font color="Maroon" title="c4">Y</font> be    <a href="pboole.html#M1" title="PBOOLE:mode.1">ManySortedSet</a> of <font color="Maroon" title="c1">I</font>;<br/>







<b>assume </b><a NAME="E1:131"/>
( <font color="Maroon" title="c2">x</font> <a href="pboole.html#R3" title="PBOOLE:pred.3">in</a> <font color="Maroon" title="c3">X</font> &amp; <font color="Maroon" title="c2">x</font> <a href="pboole.html#R3" title="PBOOLE:pred.3">in</a> <font color="Maroon" title="c4">Y</font> )
 ;<br/>

<a NAME="E2:131"/><b>then </b>
<font color="Maroon" title="c2">x</font> <a href="pboole.html#R3" title="PBOOLE:pred.3">in</a> <font color="Maroon" title="c3">X</font> <a href="pboole.html#K3" title="PBOOLE:func.3">/\</a> <font color="Maroon" title="c4">Y</font>
 
<b>by </b><i><a class="ref" href="pboole.html#T8" target="_self" title="PBOOLE:th.8">Th8</a></i>;<br/>
<b>hence </b><a NAME="E3:131"/>
<font color="Maroon" title="c3">X</font> <a href="pboole.html#K3" title="PBOOLE:func.3">/\</a> <font color="Maroon" title="c4">Y</font> <a href="hidden.html#NR2" title="HIDDEN:NR.2">&lt;&gt;</a>  <a href="pboole.html#K1" title="PBOOLE:func.1">[0]</a> <font color="Maroon" title="c1">I</font>
 <b>by </b><i><a class="ref" href="pboole.html#T136" target="_self" title="PBOOLE:th.136">Th136</a></i>;<br/>


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