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<b>let </b><font color="Maroon">c<sub>2</sub></font> be    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">c<sub>1</sub></font>;<br/>

<a NAME="E1:5_1_1"/>
 <a href="pralg_2.html#K1" target="_self">DOM</a> <font color="Maroon">c<sub>1</sub></font> <a href="hidden.html#R1">=</a>  <a href="relat_1.html#K1">dom</a> <font color="Maroon">c<sub>2</sub></font>
 
<b>by </b><i><a class="ref" href="pralg_2.html#D2" target="_self">Def2</a></i>;<br/>
<b>hence </b><a NAME="E2:5_1_1"/>
<font color="Maroon">c<sub>2</sub></font> is    <a href="pboole.html#M1">ManySortedSet</a> of  <a href="pralg_2.html#K1" target="_self">DOM</a> <font color="Maroon">c<sub>1</sub></font>
 <b>by </b><i><a class="ref" href="pboole.html#D3">PBOOLE:def 3</a></i>;<br/>


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