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<b>consider </b><font color="Maroon">D</font> being  non <a href="xboole_0.html#V1">empty</a> <a href="compts_1.html#V6">compact</a> non <a href="sppol_1.html#V1">horizontal</a> non <a href="sppol_1.html#V2">vertical</a> <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>take </b>
 <a href="sprect_1.html#K1" target="_self">SpStSeq</a> <font color="Maroon">D</font>
;<br/>

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

<b>thus </b><a NAME="E2:106_1_1"/>
 <a href="sprect_1.html#K1" target="_self">SpStSeq</a> <font color="Maroon">D</font> <a href="hidden.html#R1">=</a>  <a href="sprect_1.html#K1" target="_self">SpStSeq</a> <font color="Maroon">D</font>
 ;<br/>


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