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<b>let </b><font color="Maroon">s</font> be   <a href="qc_lang1.html#NM8">QC-formula</a>;<br/><b>let </b><font color="Maroon">h</font> be   <a href="qc_lang1.html#NM8">QC-formula</a>;<br/><b>let </b><font color="Maroon">x</font> be   <a href="qc_lang1.html#NM3">bound_QC-variable</a>;<br/>





<a NAME="E1:28"/>
<font color="Maroon">s</font> <a href="qc_lang2.html#K2">=&gt;</a> <font color="Maroon">h</font> <a href="hidden.html#R1">=</a>  <a href="qc_lang1.html#K12">'not'</a> <span class="p1">(<span class="default"><font color="Maroon">s</font> <a href="qc_lang1.html#K13">'&amp;'</a> <span class="p2">(<span class="default"><a href="qc_lang1.html#K12">'not'</a> <font color="Maroon">h</font></span>)</span></span>)</span>
 
<b>by </b><i><a class="ref" href="qc_lang2.html#D2">QC_LANG2:def 2</a></i>;<br/>
<b>hence </b><span class="p1">(<span class="default"><font color="Maroon">s</font> <a href="qc_lang2.html#K2">=&gt;</a> <font color="Maroon">h</font></span>)</span> <a href="cqc_lang.html#K17">.</a> <font color="Maroon">x</font> = 
 <a href="qc_lang1.html#K12">'not'</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">s</font> <a href="qc_lang1.html#K13">'&amp;'</a> <span class="p3">(<span class="default"><a href="qc_lang1.html#K12">'not'</a> <font color="Maroon">h</font></span>)</span></span>)</span> <a href="cqc_lang.html#K17">.</a> <font color="Maroon">x</font></span>)</span>
<b>by </b><i><a class="ref" href="cqc_lang.html#T32">CQC_LANG:32</a></i>
<br/>.= 
 <a href="qc_lang1.html#K12">'not'</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">s</font> <a href="cqc_lang.html#K17">.</a> <font color="Maroon">x</font></span>)</span> <a href="qc_lang1.html#K13">'&amp;'</a> <span class="p2">(<span class="default"><span class="p3">(<span class="default"><a href="qc_lang1.html#K12">'not'</a> <font color="Maroon">h</font></span>)</span> <a href="cqc_lang.html#K17">.</a> <font color="Maroon">x</font></span>)</span></span>)</span>
<b>by </b><i><a class="ref" href="cqc_lang.html#T34">CQC_LANG:34</a></i>
<br/>.= 
 <a href="qc_lang1.html#K12">'not'</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">s</font> <a href="cqc_lang.html#K17">.</a> <font color="Maroon">x</font></span>)</span> <a href="qc_lang1.html#K13">'&amp;'</a> <span class="p2">(<span class="default"><a href="qc_lang1.html#K12">'not'</a> <span class="p3">(<span class="default"><font color="Maroon">h</font> <a href="cqc_lang.html#K17">.</a> <font color="Maroon">x</font></span>)</span></span>)</span></span>)</span>
<b>by </b><i><a class="ref" href="cqc_lang.html#T32">CQC_LANG:32</a></i>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">s</font> <a href="cqc_lang.html#K17">.</a> <font color="Maroon">x</font></span>)</span> <a href="qc_lang2.html#K2">=&gt;</a> <span class="p1">(<span class="default"><font color="Maroon">h</font> <a href="cqc_lang.html#K17">.</a> <font color="Maroon">x</font></span>)</span>
<b>by </b><i><a class="ref" href="qc_lang2.html#D2">QC_LANG2:def 2</a></i>
;<br/><br/>


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