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<b>consider </b><font color="Maroon">X</font> being  non <a href="xboole_0.html#V1">empty</a>  <a href="hidden.html#M1">set</a> , <font color="Maroon">R</font> being   <a href="relset_1.html#NM3">Relation</a> of <font color="Maroon">X</font>, <font color="Maroon">C</font> being   <a href="binop_1.html#NM1">UnOp</a> of <font color="Maroon">X</font>;<br/>
<b>take </b>
 <a href="oposet_1.html#G1" target="_self">OrthoRelStr</a>(# <font color="Maroon">X</font>,<font color="Maroon">R</font>,<font color="Maroon">C</font> #)
;<br/>

<b>thus </b><a NAME="E2:20_1_1"/>
( not  <a href="oposet_1.html#G1" target="_self">OrthoRelStr</a>(# <font color="Maroon">X</font>,<font color="Maroon">R</font>,<font color="Maroon">C</font> #) is <a href="struct_0.html#V3">empty</a> &amp;  <a href="oposet_1.html#G1" target="_self">OrthoRelStr</a>(# <font color="Maroon">X</font>,<font color="Maroon">R</font>,<font color="Maroon">C</font> #) is <a href="oposet_1.html#V1" target="_self">strict</a> )
 ;<br/>


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