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<b>let </b><font color="Maroon">X1</font> be   <a href="subset_1.html#NM2">Subset</a> of <a href="cqc_lang.html#K7">CQC-WFF</a> ;<br/><b>let </b><font color="Maroon">X2</font> be   <a href="subset_1.html#NM2">Subset</a> of <a href="cqc_lang.html#K7">CQC-WFF</a> ;<br/><b>let </b><font color="Maroon">Y</font> be   <a href="subset_1.html#NM2">Subset</a> of <a href="cqc_lang.html#K7">CQC-WFF</a> ;<br/>





<b>assume </b><b>that </b><br/><a NAME="E1:30"/><i><font color="Green">E39</font></i>: 
<font color="Maroon">X1</font> <a href="cqc_the3.html#R4" target="_self">|-|</a> <font color="Maroon">X2</font>
 <b>and </b><br/><a NAME="E2:30"/><i><font color="Green">E42</font></i>: 
<font color="Maroon">Y</font> <a href="cqc_the3.html#R2" target="_self">|-</a> <font color="Maroon">X1</font>
 ;<br/>

<a NAME="E3:30"/>
<font color="Maroon">X1</font> <a href="cqc_the3.html#R2" target="_self">|-</a> <font color="Maroon">X2</font>
 
<b>by </b><i>, </i>;<br/>
<b>hence </b><a NAME="E4:30"/>
<font color="Maroon">Y</font> <a href="cqc_the3.html#R2" target="_self">|-</a> <font color="Maroon">X2</font>
 <b>by </b><i>, </i>;<br/>


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