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<b>consider </b><font color="Maroon">i</font> being    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">J</font>;<br/>
<b>take </b>
 <a href="unialg_1.html#K3">arity</a> <span class="p1">(<span class="default"><font color="Maroon">O</font> <a href="pralg_1.html#K14" target="_self">.</a> <font color="Maroon">i</font></span>)</span>
;<br/>

<b>let </b><font color="Maroon">j</font> be    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">J</font>;<br/>

<b>thus </b><a NAME="E2:45_1_1"/>
 <a href="unialg_1.html#K3">arity</a> <span class="p1">(<span class="default"><font color="Maroon">O</font> <a href="pralg_1.html#K14" target="_self">.</a> <font color="Maroon">i</font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="unialg_1.html#K3">arity</a> <span class="p1">(<span class="default"><font color="Maroon">O</font> <a href="pralg_1.html#K14" target="_self">.</a> <font color="Maroon">j</font></span>)</span>
 <b>by </b><i/>;<br/>


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