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<b>let </b><font color="Maroon">P</font> be   <a href="struct_0.html#NM2">Subset</a> of <span class="p1">(<span class="default"><a href="euclid.html#K15">TOP-REAL</a> 2</span>)</span>;<br/>

<b>thus </b><span class="p1">(<span class="default"><a href="pscomp_1.html#K20" target="_self">NW-corner</a> <font color="Maroon">P</font></span>)</span> <a href="euclid.html#K22">`2</a>  = 
 <a href="pscomp_1.html#K16" target="_self">N-bound</a> <font color="Maroon">P</font>
<b>by </b><i/>
<br/>.= 
<span class="p1">(<span class="default"><a href="pscomp_1.html#K21" target="_self">NE-corner</a> <font color="Maroon">P</font></span>)</span> <a href="euclid.html#K22">`2</a> 
<b>by </b><i/>
;<br/>


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