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<b>let </b><font color="Maroon">a</font> be    <a href="hidden.html#M1">set</a> ;<br/>

<b>thus </b><span class="p1">(<span class="default"><a href="pboole.html#K8">*--&gt;</a> <font color="Maroon">a</font></span>)</span> <a href="funct_2.html#K3">.</a> 0 = 
0 <a href="finseq_2.html#K2">|-&gt;</a> <font color="Maroon">a</font>
<b>by </b><i><a class="ref" href="pboole.html#D20">PBOOLE:def 20</a></i>
<br/>.= 
 <a href="xboole_0.html#K1">{}</a> 
<b>by </b><i><a class="ref" href="finseq_2.html#T72">FINSEQ_2:72</a></i>
;<br/>


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