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<b>let </b><font color="Maroon">c<sub>1</sub></font> be   <a href="nat_1.html#NM1">Nat</a>;<br/><b>let </b><font color="Maroon">c<sub>2</sub></font> be   <a href="cqc_lang.html#NM2">CQC-variable_list</a> of <font color="Maroon">c<sub>1</sub></font>;<br/><b>let </b><font color="Maroon">c<sub>3</sub></font> be   <a href="substut1.html#NM1">CQC_Substitution</a>;<br/>





<b>reconsider </b><font color="Maroon">c<sub>4</sub></font> = <font color="Maroon">c<sub>2</sub></font> as    <a href="finseq_1.html#M2">FinSequence</a> of  <a href="qc_lang1.html#K2">bound_QC-variables</a>  <b>by </b><i><a class="ref" href="substut1.html#T34">SUBSTUT1:34</a></i>;<br/>
<b>reconsider </b><font color="Maroon">c<sub>5</sub></font> =  <a href="substut1.html#K5">CQC_Subst</a> <font color="Maroon">c<sub>4</sub></font>,<font color="Maroon">c<sub>3</sub></font> as    <a href="finseq_1.html#M2">FinSequence</a> of  <a href="qc_lang1.html#K2">bound_QC-variables</a>  ;<br/>
<a NAME="E3:16"/><i><font color="Green">E10</font></i>: 
<font color="Maroon">c<sub>5</sub></font> <a href="hidden.html#R1">=</a>  <a href="substut1.html#K3">CQC_Subst</a> <span class="p1">(<span class="default"><a href="substut1.html#K4">@</a> <font color="Maroon">c<sub>4</sub></font></span>)</span>,<font color="Maroon">c<sub>3</sub></font>
 
<b>by </b><i><a class="ref" href="substut1.html#D5">SUBSTUT1:def 5</a></i>;<br/>
<a NAME="E4:16"/>
 <a href="finseq_1.html#K3">len</a> <font color="Maroon">c<sub>4</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>1</sub></font>
 
<b>by </b><i><a class="ref" href="qc_lang1.html#D8">QC_LANG1:def 8</a></i>;<br/>
<a NAME="E5:16"/><b>then </b>
 <a href="finseq_1.html#K3">len</a> <span class="p1">(<span class="default"><a href="substut1.html#K4">@</a> <font color="Maroon">c<sub>4</sub></font></span>)</span> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>1</sub></font>
 
<b>by </b><i><a class="ref" href="substut1.html#D4">SUBSTUT1:def 4</a></i>;<br/>
<a NAME="E6:16"/><b>then </b>
 <a href="finseq_1.html#K3">len</a> <font color="Maroon">c<sub>5</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>1</sub></font>
 
<b>by </b><i><a class="txt" href="sublemma.html#E3:16"><i><font color="Green">E10</font></i></a>, <a class="ref" href="substut1.html#D3">SUBSTUT1:def 3</a></i>;<br/>
<a NAME="E7:16"/><b>then </b>
<font color="Maroon">c<sub>5</sub></font> is   <a href="cqc_lang.html#NM2">CQC-variable_list</a> of <font color="Maroon">c<sub>1</sub></font>
 
<b>by </b><i><a class="ref" href="substut1.html#T34">SUBSTUT1:34</a></i>;<br/>
<b>hence </b><a NAME="E8:16"/>
 <a href="substut1.html#K3">CQC_Subst</a> <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>3</sub></font> is   <a href="cqc_lang.html#NM2">CQC-variable_list</a> of <font color="Maroon">c<sub>1</sub></font>
 <b>by </b><i><a class="txt" href="sublemma.html#E3:16"><i><font color="Green">E10</font></i></a>, <a class="ref" href="substut1.html#D4">SUBSTUT1:def 4</a></i>;<br/>


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