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<b>consider </b><font color="Maroon">c<sub>4</sub></font> being   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">c<sub>1</sub></font><b> such that </b><br/><a NAME="E2:77_1_1"/><i><font color="Green">E66</font></i>: 
 <a href="semi_af1.html#R3" target="_self">congr</a> <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>3</sub></font>,<font color="Maroon">c<sub>3</sub></font>,<font color="Maroon">c<sub>4</sub></font>
 <b>by </b><i><a class="ref" href="semi_af1.html#T82" target="_self">Th82</a></i>;<br/>
<a NAME="E3:77_1_1"/><i><font color="Green">E67</font></i>: 
 <a href="semi_af1.html#R3" target="_self">congr</a> <font color="Maroon">c<sub>3</sub></font>,<font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>4</sub></font>,<font color="Maroon">c<sub>3</sub></font>
 
<b>by </b><i><a class="txt" href="semi_af1.html#E2:77_1_1"><i><font color="Green">E66</font></i></a>, <a class="ref" href="semi_af1.html#T87" target="_self">Th87</a></i>;<br/>
<b>take </b>
<font color="Maroon">c<sub>4</sub></font>
;<br/>

<b>thus </b><a NAME="E4:77_1_1"/>
 <a href="semi_af1.html#K1" target="_self">sum</a> <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>4</sub></font>,<font color="Maroon">c<sub>3</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>3</sub></font>
 <b>by </b><i><a class="txt" href="semi_af1.html#E3:77_1_1"><i><font color="Green">E67</font></i></a>, <a class="ref" href="semi_af1.html#D5" target="_self">Def5</a></i>;<br/>


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