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<b>set </b><font color="Maroon">c<sub>3</sub></font> =  <a href="finseq_1.html#K3">len</a> <font color="Maroon">c<sub>2</sub></font>;<br/>
<b>set </b><font color="Maroon">c<sub>4</sub></font> = <span class="p1">{<span class="default"> <font color="Olive">b<sub>1</sub></font> where B is   <a href="qc_lang1.html#NM2">QC-pred_symbol</a> :  <a href="qc_lang1.html#K6" target="_self">the_arity_of</a> <font color="Olive">b<sub>1</sub></font> <a href="hidden.html#R1">=</a>  <a href="finseq_1.html#K3">len</a> <font color="Maroon">c<sub>2</sub></font> </span>}</span> ;<br/>
<a NAME="E1:20_1_1"/>
( <span class="p1">{<span class="default"> <font color="Olive">b<sub>1</sub></font> where B is   <a href="qc_lang1.html#NM2">QC-pred_symbol</a> :  <a href="qc_lang1.html#K6" target="_self">the_arity_of</a> <font color="Olive">b<sub>1</sub></font> <a href="hidden.html#R1">=</a>  <a href="finseq_1.html#K3">len</a> <font color="Maroon">c<sub>2</sub></font> </span>}</span>  <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><a href="finseq_1.html#K3">len</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="qc_lang1.html#K7" target="_self">-ary_QC-pred_symbols</a>  &amp; <font color="Maroon">c<sub>1</sub></font> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <font color="Olive">b<sub>1</sub></font> where B is   <a href="qc_lang1.html#NM2">QC-pred_symbol</a> :  <a href="qc_lang1.html#K6" target="_self">the_arity_of</a> <font color="Olive">b<sub>1</sub></font> <a href="hidden.html#R1">=</a>  <a href="finseq_1.html#K3">len</a> <font color="Maroon">c<sub>2</sub></font> </span>}</span>  )
 
<b>by </b><i><a class="txt" href="qc_lang1.html#E1:20"><i><font color="Green">E12</font></i></a></i>;<br/>
<b>then reconsider </b><font color="Maroon">c<sub>5</sub></font> = <font color="Maroon">c<sub>1</sub></font> as   <a href="qc_lang1.html#NM6">QC-pred_symbol</a> of <span class="p1">(<span class="default"><a href="finseq_1.html#K3">len</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> ;<br/>
<b>reconsider </b><font color="Maroon">c<sub>6</sub></font> = <font color="Maroon">c<sub>2</sub></font> as    <a href="qc_lang1.html#M1" target="_self">QC-variable_list</a> of  <a href="finseq_1.html#K3">len</a> <font color="Maroon">c<sub>2</sub></font> <b>by </b><i><a class="ref" href="qc_lang1.html#D8" target="_self">Def8</a></i>;<br/>
<b>reconsider </b><font color="Maroon">c<sub>7</sub></font> = <span class="p1"><a href="finseq_1.html#K12">&lt;*</a><span class="default"><font color="Maroon">c<sub>5</sub></font></span><a href="finseq_1.html#K12">*&gt;</a></span> <a href="finseq_1.html#K7">^</a> <font color="Maroon">c<sub>6</sub></font> as    <a href="finseq_1.html#M2">FinSequence</a> of <span class="p1"><a href="mcart_1.html#K12">[:</a><span class="default"><a href="numbers.html#K5">NAT</a> ,<a href="numbers.html#K5">NAT</a> </span><a href="mcart_1.html#K12">:]</a></span> <b>by </b><i><a class="txt" href="qc_lang1.html#E21"><i><font color="Green">Lemma8</font></i></a></i>;<br/>
<a NAME="E5:20_1_1"/>
<font color="Maroon">c<sub>7</sub></font> is   <a href="qc_lang1.html#NM8">QC-formula</a>
 
<b>by </b><i><a class="ref" href="qc_lang1.html#D9" target="_self">Def9</a>, <a class="ref" href="qc_lang1.html#T21" target="_self">Th21</a></i>;<br/>
<b>hence </b><a NAME="E6:20_1_1"/>
<span class="p1"><a href="finseq_1.html#K12">&lt;*</a><span class="default"><font color="Maroon">c<sub>1</sub></font></span><a href="finseq_1.html#K12">*&gt;</a></span> <a href="finseq_1.html#K7">^</a> <font color="Maroon">c<sub>2</sub></font> is    <a href="subset_1.html#M1">Element</a> of  <a href="qc_lang1.html#K8" target="_self">QC-WFF</a> 
 ;<br/>


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