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<b>let </b><font color="Maroon">I</font> be    <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">X</font> be    <a href="pboole.html#M1" target="_self">ManySortedSet</a> of <font color="Maroon">I</font>;<br/><b>let </b><font color="Maroon">Y</font> be    <a href="pboole.html#M1" target="_self">ManySortedSet</a> of <font color="Maroon">I</font>;<br/>





<b>thus </b><font color="Maroon">X</font> <a href="pboole.html#K5" target="_self">\+\</a> <font color="Maroon">Y</font> = 
<span class="p1">(<span class="default"><font color="Maroon">X</font> <a href="pboole.html#K4" target="_self">\</a> <span class="p2">(<span class="default"><font color="Maroon">X</font> <a href="pboole.html#K3" target="_self">/\</a> <font color="Maroon">Y</font></span>)</span></span>)</span> <a href="pboole.html#K2" target="_self">\/</a> <span class="p1">(<span class="default"><font color="Maroon">Y</font> <a href="pboole.html#K4" target="_self">\</a> <font color="Maroon">X</font></span>)</span>
<b>by </b><i/>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">X</font> <a href="pboole.html#K4" target="_self">\</a> <span class="p2">(<span class="default"><font color="Maroon">X</font> <a href="pboole.html#K3" target="_self">/\</a> <font color="Maroon">Y</font></span>)</span></span>)</span> <a href="pboole.html#K2" target="_self">\/</a> <span class="p1">(<span class="default"><font color="Maroon">Y</font> <a href="pboole.html#K4" target="_self">\</a> <span class="p2">(<span class="default"><font color="Maroon">X</font> <a href="pboole.html#K3" target="_self">/\</a> <font color="Maroon">Y</font></span>)</span></span>)</span>
<b>by </b><i/>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">X</font> <a href="pboole.html#K2" target="_self">\/</a> <font color="Maroon">Y</font></span>)</span> <a href="pboole.html#K4" target="_self">\</a> <span class="p1">(<span class="default"><font color="Maroon">X</font> <a href="pboole.html#K3" target="_self">/\</a> <font color="Maroon">Y</font></span>)</span>
<b>by </b><i/>
;<br/>


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