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<a NAME="E1:2_1_1"/>
( <font color="Maroon">x</font> <a href="hidden.html#R1">=</a> <font color="Maroon">y</font> or <font color="Maroon">x</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">y</font> )
 
;<br/>
<b>hence </b><a NAME="E2:2_1_1"/>
 <a href="cqc_lang.html#K1" target="_self">IFEQ</a> <font color="Maroon">x</font>,<font color="Maroon">y</font>,<font color="Maroon">a</font>,<font color="Maroon">b</font> is    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">D</font>
 <b>by </b><i/>;<br/>


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