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<b>consider </b><font color="Maroon">c<sub>1</sub></font> being   <a href="qc_lang1.html#NM3">bound_QC-variable</a>, <font color="Maroon">c<sub>2</sub></font> being    <a href="subset_1.html#M2">Element</a> of  <a href="cqc_lang.html#K7">CQC-WFF</a> ;<br/>
<b>set </b><font color="Maroon">c<sub>3</sub></font> =  <a href="cqc_lang.html#K16">Ex</a> <font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">c<sub>2</sub></font>;<br/>
<a NAME="E2:19"/>
 <a href="cqc_lang.html#K16">Ex</a> <font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#R2">in</a>  <a href="goedelcp.html#K1" target="_self">ExCl</a> 
 
<b>by </b><i><a class="ref" href="goedelcp.html#D3" target="_self">Def3</a></i>;<br/>
<b>hence </b><a NAME="E3:19"/>
not  <a href="goedelcp.html#K1" target="_self">ExCl</a>  is <a href="xboole_0.html#V1">empty</a>
 ;<br/>

<b>thus </b><a NAME="E4:19"/>
 <a href="goedelcp.html#K1" target="_self">ExCl</a>  is <a href="card_4.html#V1">countable</a>
 <b>by </b><i><a class="ref" href="goedelcp.html#T19" target="_self">Th19</a>, <a class="ref" href="card_4.html#T46">CARD_4:46</a></i>;<br/>


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