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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="subset_1.html#M2">Element</a> of  <a href="cqc_lang.html#K7" target="_self">CQC-WFF</a> ;<br/>



<a NAME="E1:27"/>
<font color="Maroon">c<sub>1</sub></font> <a href="qc_lang2.html#K3">'or'</a> <font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#R1">=</a>  <a href="cqc_lang.html#K10" target="_self">'not'</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="cqc_lang.html#K10" target="_self">'not'</a> <font color="Maroon">c<sub>1</sub></font></span>)</span> <a href="cqc_lang.html#K11" target="_self">'&amp;'</a> <span class="p2">(<span class="default"><a href="cqc_lang.html#K10" target="_self">'not'</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span>
 
<b>by </b><i><a class="ref" href="qc_lang2.html#D3">QC_LANG2:def 3</a></i>;<br/>
<b>hence </b><a NAME="E2:27"/>
<font color="Maroon">c<sub>1</sub></font> <a href="qc_lang2.html#K3">'or'</a> <font color="Maroon">c<sub>2</sub></font> is    <a href="subset_1.html#M2">Element</a> of  <a href="cqc_lang.html#K7" target="_self">CQC-WFF</a> 
 ;<br/>


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