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<b>let </b><font color="Maroon">c<sub>1</sub></font>, <font color="Maroon">c<sub>2</sub></font> be   <a href="qc_lang1.html#NM3">bound_QC-variable</a>;<br/>



<b>set </b><font color="Maroon">c<sub>3</sub></font> = <span class="p1"><a href="substut2.html#K2" target="_self">[</a><span class="default"><a href="cqc_lang.html#K9">VERUM</a> ,<span class="p2">(<span class="default"><a href="substut2.html#K3" target="_self">Sbst</a> <font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">c<sub>2</sub></font></span>)</span></span><a href="substut2.html#K2" target="_self">]</a></span>;<br/>
<a NAME="E1:19"/><i><font color="Green">E13</font></i>: 
<span class="p1"><a href="substut2.html#K2" target="_self">[</a><span class="default"><a href="cqc_lang.html#K9">VERUM</a> ,<span class="p2">(<span class="default"><a href="substut2.html#K3" target="_self">Sbst</a> <font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">c<sub>2</sub></font></span>)</span></span><a href="substut2.html#K2" target="_self">]</a></span> is <a href="substut1.html#V2">Sub_VERUM</a>
 
<b>by </b><i><a class="ref" href="substut1.html#D19">SUBSTUT1:def 19</a></i>;<br/>
<b>thus </b><a NAME="E2:19"/>
<a href="cqc_lang.html#K9">VERUM</a>  <a href="substut2.html#K4" target="_self">.</a> <font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#R1">=</a>  <a href="cqc_lang.html#K9">VERUM</a> 
 <b>by </b><i><a class="txt" href="substut2.html#E1:19"><i><font color="Green">E13</font></i></a>, <a class="ref" href="sublemma.html#T3">SUBLEMMA:3</a></i>;<br/>


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