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<a NAME="E1:4_1_1"/>
 <a href="relat_1.html#K1">dom</a> <span class="p1">(<span class="default"><font color="Maroon">F</font> <a href="pralg_1.html#K16">..</a> <font color="Maroon">A</font></span>)</span> <a href="hidden.html#R1">=</a> <font color="Maroon">I</font>
 
<b>by </b><i><a class="ref" href="pboole.html#D3">PBOOLE:def 3</a></i>;<br/>
<b>hence </b><a NAME="E2:4_1_1"/>
<font color="Maroon">F</font> <a href="pralg_1.html#K15">..</a> <font color="Maroon">A</font> is    <a href="pboole.html#M1">ManySortedSet</a> of <font color="Maroon">I</font>
 ;<br/>


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