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<b>consider </b><font color="Maroon">a</font> being   <a href="pre_topc.html#NM2">Point</a> of <font color="Maroon">CLSP</font>, <font color="Maroon">b</font> being   <a href="pre_topc.html#NM2">Point</a> of <font color="Maroon">CLSP</font>, <font color="Maroon">c</font> being   <a href="pre_topc.html#NM2">Point</a> of <font color="Maroon">CLSP</font><b> such that </b><br/><a NAME="E2:29_1_1"/><i><font color="Green">E19</font></i>: 
not <font color="Maroon">a</font>,<font color="Maroon">b</font>,<font color="Maroon">c</font> <a href="collsp.html#R1" target="_self">is_collinear</a> 
 <b>by </b><i/>;<br/>
<a NAME="E3:29_1_1"/><i><font color="Green">E20</font></i>: 
<font color="Maroon">a</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">b</font>
 
<b>by </b><i>, </i>;<br/>
<b>take </b>
 <a href="collsp.html#K1" target="_self">Line</a> <font color="Maroon">a</font>,<font color="Maroon">b</font>
;<br/>

<b>thus </b><a NAME="E4:29_1_1"/>
 ex <font color="Olive">a</font>, <font color="Olive">b</font> being  <a href="pre_topc.html#NM2">Point</a> of <font color="Maroon">CLSP</font> st <br/>( <font color="Olive">a</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Olive">b</font> &amp;  <a href="collsp.html#K1" target="_self">Line</a> <font color="Maroon">a</font>,<font color="Maroon">b</font> <a href="hidden.html#R1">=</a>  <a href="collsp.html#K1" target="_self">Line</a> <font color="Olive">a</font>,<font color="Olive">b</font> )
 <b>by </b><i/>;<br/>


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