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<b>take </b>
 <a href="osalg_1.html#K5" title="OSALG_1:func.5">ConstOSSet</a> <font color="Maroon" title="c1">R</font>,1
;<br/>

<b>thus </b><a NAME="E1:56_1_1"/>
 <a href="osalg_1.html#K5" title="OSALG_1:func.5">ConstOSSet</a> <font color="Maroon" title="c1">R</font>,1 is <a href="relat_1.html#V2" title="RELAT_1:attr.2">non-empty</a>
 <b>by </b><i><a class="ref" href="osalg_1.html#T15" target="_self" title="OSALG_1:th.15">Th15</a></i>;<br/>


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