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<b>let </b><font color="Maroon">c<sub>3</sub></font>, <font color="Maroon">c<sub>4</sub></font> be  <a href="graph_1.html#V1" target="_self">strict</a> <a href="graph_1.html#NM1">Graph</a>;<br/>

<b>assume </b><a NAME="E1:59"/><i><font color="Green">E37</font></i>: 
<font color="Maroon">c<sub>3</sub></font> <a href="graph_1.html#R4" target="_self">c=</a> <font color="Maroon">c<sub>4</sub></font>
 ;<br/>

<a NAME="E2:59"/><b>then </b><i><font color="Green">E38</font></i>: 
<font color="Maroon">c<sub>3</sub></font> <a href="graph_1.html#K1" target="_self">\/</a> <font color="Maroon">c<sub>4</sub></font> <a href="graph_1.html#R4" target="_self">c=</a> <font color="Maroon">c<sub>4</sub></font>
 
<b>by </b><i><a class="ref" href="graph_1.html#T22" target="_self">Th22</a></i>;<br/>
<a NAME="E3:59"/>
<font color="Maroon">c<sub>4</sub></font> <a href="graph_1.html#R4" target="_self">c=</a> <font color="Maroon">c<sub>3</sub></font> <a href="graph_1.html#K1" target="_self">\/</a> <font color="Maroon">c<sub>4</sub></font>
 
<b>by </b><i><a class="txt" href="graph_1.html#E1:59"><i><font color="Green">E37</font></i></a>, <a class="ref" href="graph_1.html#T20" target="_self">Th20</a></i>;<br/>
<b>hence </b><a NAME="E4:59"/>
<font color="Maroon">c<sub>3</sub></font> <a href="graph_1.html#K1" target="_self">\/</a> <font color="Maroon">c<sub>4</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>4</sub></font>
 <b>by </b><i><a class="txt" href="graph_1.html#E2:59"><i><font color="Green">E38</font></i></a>, <a class="ref" href="graph_1.html#T16" target="_self">Th16</a></i>;<br/>

<b>hence </b><a NAME="E5:59"/>
<font color="Maroon">c<sub>4</sub></font> <a href="graph_1.html#K1" target="_self">\/</a> <font color="Maroon">c<sub>3</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>4</sub></font>
 <b>by </b><i><a class="txt" href="graph_1.html#E1:59"><i><font color="Green">E37</font></i></a>, <a class="ref" href="graph_1.html#T12" target="_self">Th12</a></i>;<br/>


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