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<b>set </b><font color="Maroon">x</font> =  <a href="pboole.html#K1">[0]</a> <font color="Maroon">I</font>;<br/>
<a NAME="E1:22_1_1"/>
 <a href="pboole.html#K1">[0]</a> <font color="Maroon">I</font> <a href="pboole.html#R2">c=</a> <font color="Maroon">A</font>
 
<b>by </b><i><a class="ref" href="pboole.html#T49">PBOOLE:49</a></i>;<br/>
<b>then reconsider </b><font color="Maroon">x</font> =  <a href="pboole.html#K1">[0]</a> <font color="Maroon">I</font> as    <a href="pboole.html#M4">ManySortedSubset</a> of <font color="Maroon">A</font> <b>by </b><i><a class="ref" href="pboole.html#D23">PBOOLE:def 23</a></i>;<br/>
<b>take </b>
<font color="Maroon">x</font>
;<br/>

<b>thus </b><a NAME="E3:22_1_1"/>
( <font color="Maroon">x</font> is <a href="relat_1.html#V3">empty-yielding</a> &amp; <font color="Maroon">x</font> is <a href="finset_1.html#V2">locally-finite</a> )
 ;<br/>


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