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<b>consider </b><font color="Maroon" title="c2">z</font> being  non <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a>  <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a> ;<br/>
<b>take </b>
 <a href="osalg_1.html#K4" title="OSALG_1:func.4">ConstOSSet</a> <font color="Maroon" title="c1">R</font>,<font color="Maroon" title="c2">z</font>
;<br/>

<b>thus </b><a NAME="E2:53_1_1"/>
 <a href="osalg_1.html#K4" title="OSALG_1:func.4">ConstOSSet</a> <font color="Maroon" title="c1">R</font>,<font color="Maroon" title="c2">z</font> is <a href="osalg_1.html#V11" title="OSALG_1:attr.11">order-sorted</a>
 <b>by </b><i><a class="ref" href="osalg_1.html#T16" target="_self" title="OSALG_1:th.16">Th16</a></i>;<br/>


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