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<b>thus </b><a NAME="E1:46_1_1"/>
<font color="Maroon">O</font> <a href="binop_1.html#K2">.</a> <font color="Maroon">a</font>,<font color="Maroon">b</font> is    <a href="subset_1.html#M2">Element</a> of <font color="Maroon">B</font>
 ;<br/>


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