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<b>let </b><font color="Maroon" title="c1">p</font>, <font color="Maroon" title="c2">q</font>, <font color="Maroon" title="c3">r</font>, <font color="Maroon" title="c4">s</font> be    <a href="subset_1.html#M2" title="SUBSET_1:mode.2">Element</a> of  <a href="cqc_lang.html#K4" title="CQC_LANG:func.4">CQC-WFF</a> ;<br/>







<b>assume </b><b>that </b><br/><a NAME="E1:39"/><i><font color="Green" title="E34">A1</font></i>: 
<font color="Maroon" title="c1">p</font> <a href="cqc_the3.html#R5" title="CQC_THE3:pred.5">|-|</a> <font color="Maroon" title="c2">q</font>
 <b>and </b><br/><a NAME="E2:39"/><i><font color="Green" title="E35">A2</font></i>: 
<font color="Maroon" title="c3">r</font> <a href="cqc_the3.html#R5" title="CQC_THE3:pred.5">|-|</a> <font color="Maroon" title="c4">s</font>
 ;<br/>

<a NAME="E3:39"/><i><font color="Green" title="E36">A3</font></i>: 
<font color="Maroon" title="c1">p</font> <a href="cqc_lang.html#K8" title="CQC_LANG:func.8">'&amp;'</a> <font color="Maroon" title="c3">r</font> <a href="cqc_the3.html#R1" title="CQC_THE3:pred.1">|-</a> <font color="Maroon" title="c2">q</font> <a href="cqc_lang.html#K8" title="CQC_LANG:func.8">'&amp;'</a> <font color="Maroon" title="c4">s</font>
 
<b>by </b><i><a class="txt" href="cqc_the3.html#E1:39"><i><font color="Green" title="E34">A1</font></i></a>, <a class="txt" href="cqc_the3.html#E2:39"><i><font color="Green" title="E35">A2</font></i></a>, <a class="txt" href="cqc_the3.html#E42"><i><font color="Green" title="E33">Lm4</font></i></a></i>;<br/>
<a NAME="E4:39"/>
<font color="Maroon" title="c2">q</font> <a href="cqc_lang.html#K8" title="CQC_LANG:func.8">'&amp;'</a> <font color="Maroon" title="c4">s</font> <a href="cqc_the3.html#R1" title="CQC_THE3:pred.1">|-</a> <font color="Maroon" title="c1">p</font> <a href="cqc_lang.html#K8" title="CQC_LANG:func.8">'&amp;'</a> <font color="Maroon" title="c3">r</font>
 
<b>by </b><i><a class="txt" href="cqc_the3.html#E1:39"><i><font color="Green" title="E34">A1</font></i></a>, <a class="txt" href="cqc_the3.html#E2:39"><i><font color="Green" title="E35">A2</font></i></a>, <a class="txt" href="cqc_the3.html#E42"><i><font color="Green" title="E33">Lm4</font></i></a></i>;<br/>
<b>hence </b><a NAME="E5:39"/>
<font color="Maroon" title="c1">p</font> <a href="cqc_lang.html#K8" title="CQC_LANG:func.8">'&amp;'</a> <font color="Maroon" title="c3">r</font> <a href="cqc_the3.html#R5" title="CQC_THE3:pred.5">|-|</a> <font color="Maroon" title="c2">q</font> <a href="cqc_lang.html#K8" title="CQC_LANG:func.8">'&amp;'</a> <font color="Maroon" title="c4">s</font>
 <b>by </b><i><a class="txt" href="cqc_the3.html#E3:39"><i><font color="Green" title="E36">A3</font></i></a>, <a class="ref" href="cqc_the3.html#D5" target="_self" title="CQC_THE3:def.5">Def5</a></i>;<br/>


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