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<b>let </b><font color="Maroon">c<sub>5</sub></font> be   <a href="collsp.html#NM2">CollSp</a>;<br/><b>let </b><font color="Maroon">c<sub>6</sub></font>, <font color="Maroon">c<sub>7</sub></font>, <font color="Maroon">c<sub>8</sub></font> be   <a href="pre_topc.html#NM2">Point</a> of <font color="Maroon">c<sub>5</sub></font>;<br/>







<b>assume </b><a NAME="E1:16"/>
<font color="Maroon">c<sub>6</sub></font>,<font color="Maroon">c<sub>7</sub></font>,<font color="Maroon">c<sub>8</sub></font> <a href="collsp.html#R1" target="_self">is_collinear</a> 
 ;<br/>

<a NAME="E2:16"/><b>then </b>
<font color="Maroon">c<sub>7</sub></font>,<font color="Maroon">c<sub>6</sub></font>,<font color="Maroon">c<sub>8</sub></font> <a href="collsp.html#R1" target="_self">is_collinear</a> 
 
<b>by </b><i><a class="ref" href="collsp.html#T9" target="_self">Th9</a></i>;<br/>
<b>hence </b><a NAME="E3:16"/>
<font color="Maroon">c<sub>7</sub></font>,<font color="Maroon">c<sub>8</sub></font>,<font color="Maroon">c<sub>6</sub></font> <a href="collsp.html#R1" target="_self">is_collinear</a> 
 <b>by </b><i><a class="ref" href="collsp.html#T9" target="_self">Th9</a></i>;<br/>


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