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<b>let </b><font color="Maroon">CLSP</font> be   <a href="collsp.html#NM2">CollSp</a>;<br/><b>let </b><font color="Maroon">a</font> be   <a href="pre_topc.html#NM2">Point</a> of <font color="Maroon">CLSP</font>;<br/><b>let </b><font color="Maroon">b</font> be   <a href="pre_topc.html#NM2">Point</a> of <font color="Maroon">CLSP</font>;<br/><b>let </b><font color="Maroon">c</font> be   <a href="pre_topc.html#NM2">Point</a> of <font color="Maroon">CLSP</font>;<br/><b>let </b><font color="Maroon">d</font> be   <a href="pre_topc.html#NM2">Point</a> of <font color="Maroon">CLSP</font>;<br/>









<b>assume </b><a NAME="E1:15"/><i><font color="Green">E19</font></i>: 
( <font color="Maroon">a</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">b</font> &amp; <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>  &amp; <font color="Maroon">a</font>,<font color="Maroon">b</font>,<font color="Maroon">d</font> <a href="collsp.html#R1" target="_self">is_collinear</a>  )
 ;<br/>

<a NAME="E2:15"/>
<font color="Maroon">a</font>,<font color="Maroon">b</font>,<font color="Maroon">a</font> <a href="collsp.html#R1" target="_self">is_collinear</a> 
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E3:15"/>
<font color="Maroon">a</font>,<font color="Maroon">c</font>,<font color="Maroon">d</font> <a href="collsp.html#R1" target="_self">is_collinear</a> 
 <b>by </b><i>, </i>;<br/>


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