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<b>consider </b><font color="Maroon">c<sub>2</sub></font> being    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">c<sub>1</sub></font>, <font color="Maroon">c<sub>3</sub></font> being   <a href="orders_1.html#NM2">Order</a> of <font color="Maroon">c<sub>2</sub></font>;<br/>
<a NAME="E2:3_1_1"/>
<a href="orders_2.html#G1">RelStr</a>(# <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>3</sub></font> #) <a href="yellow21.html#K1" target="_self">as_1-sorted</a>  <a href="hidden.html#R1">=</a>  <a href="orders_2.html#G1">RelStr</a>(# <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>3</sub></font> #)
 
<b>by </b><i><a class="ref" href="yellow21.html#D1" target="_self">Def1</a></i>;<br/>
<b>hence </b><a NAME="E3:3_1_1"/>
not  <a href="yellow21.html#K2" target="_self">POSETS</a> <font color="Maroon">c<sub>1</sub></font> is <a href="xboole_0.html#V1">empty</a>
 <b>by </b><i><a class="ref" href="yellow21.html#D2" target="_self">Def2</a></i>;<br/>


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