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<b>consider </b><font color="Maroon" title="c1">D</font> being  non <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a> <a href="compts_1.html#V6" title="COMPTS_1:attr.6">compact</a> non <a href="sppol_1.html#V1" title="SPPOL_1:attr.1">horizontal</a> non <a href="sppol_1.html#V2" title="SPPOL_1:attr.2">vertical</a> <a href="struct_0.html#NM2" title="STRUCT_0:NM.2">Subset</a> of <span class="p1">(<span class="default"><a href="euclid.html#K15" title="EUCLID:func.15">TOP-REAL</a> 2</span>)</span>;<br/>
<b>take </b>
 <a href="sprect_1.html#K1" title="SPRECT_1:func.1">SpStSeq</a> <font color="Maroon" title="c1">D</font>
;<br/>

<b>take </b>
<font color="Maroon" title="c1">D</font>
; <i><font color="Red">:: according to </font></i><a class="ref" href="sprect_1.html#D2" target="_self" title="SPRECT_1:def.2">SPRECT_1:def 2</a><br/>

<b>thus </b><a NAME="E2:106_1_1"/>
 <a href="sprect_1.html#K1" title="SPRECT_1:func.1">SpStSeq</a> <font color="Maroon" title="c1">D</font> <a href="relset_1.html#R2" title="RELSET_1:pred.2">=</a>  <a href="sprect_1.html#K1" title="SPRECT_1:func.1">SpStSeq</a> <font color="Maroon" title="c1">D</font>
 ;<br/>


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