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<b>let </b><font color="Maroon">c<sub>1</sub></font> be   <a href="parsp_2.html#NM1">FanodesSp</a>;<br/><b>let </b><font color="Maroon">c<sub>2</sub></font>, <font color="Maroon">c<sub>3</sub></font>, <font color="Maroon">c<sub>4</sub></font>, <font color="Maroon">c<sub>5</sub></font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">c<sub>1</sub></font>;<br/>









<b>assume </b><a NAME="E1:43"/><i><font color="Green">E34</font></i>: 
 <a href="parsp_2.html#R2" target="_self">parallelogram</a> <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>3</sub></font>,<font color="Maroon">c<sub>4</sub></font>,<font color="Maroon">c<sub>5</sub></font>
 ;<br/>

<a NAME="E2:43"/><b>then </b><i><font color="Green">E35</font></i>: 
not <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>3</sub></font>,<font color="Maroon">c<sub>4</sub></font> <a href="parsp_2.html#R1" target="_self">is_collinear</a> 
 
<b>by </b><i><a class="ref" href="parsp_2.html#T35" target="_self">Th35</a></i>;<br/>
<a NAME="E3:43"/><i><font color="Green">E36</font></i>: 
not <font color="Maroon">c<sub>3</sub></font>,<font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>5</sub></font> <a href="parsp_2.html#R1" target="_self">is_collinear</a> 
 
<b>by </b><i><a class="txt" href="parsp_2.html#E1:43"><i><font color="Green">E34</font></i></a>, <a class="ref" href="parsp_2.html#T35" target="_self">Th35</a></i>;<br/>
<a NAME="E4:43"/><i><font color="Green">E37</font></i>: 
not <font color="Maroon">c<sub>4</sub></font>,<font color="Maroon">c<sub>5</sub></font>,<font color="Maroon">c<sub>2</sub></font> <a href="parsp_2.html#R1" target="_self">is_collinear</a> 
 
<b>by </b><i><a class="txt" href="parsp_2.html#E1:43"><i><font color="Green">E34</font></i></a>, <a class="ref" href="parsp_2.html#T35" target="_self">Th35</a></i>;<br/>
<a NAME="E5:43"/>
not <font color="Maroon">c<sub>5</sub></font>,<font color="Maroon">c<sub>4</sub></font>,<font color="Maroon">c<sub>3</sub></font> <a href="parsp_2.html#R1" target="_self">is_collinear</a> 
 
<b>by </b><i><a class="txt" href="parsp_2.html#E1:43"><i><font color="Green">E34</font></i></a>, <a class="ref" href="parsp_2.html#T35" target="_self">Th35</a></i>;<br/>
<b>hence </b><a NAME="E6:43"/>
( not <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>3</sub></font>,<font color="Maroon">c<sub>4</sub></font> <a href="parsp_2.html#R1" target="_self">is_collinear</a>  &amp; not <font color="Maroon">c<sub>3</sub></font>,<font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>5</sub></font> <a href="parsp_2.html#R1" target="_self">is_collinear</a>  &amp; not <font color="Maroon">c<sub>4</sub></font>,<font color="Maroon">c<sub>5</sub></font>,<font color="Maroon">c<sub>2</sub></font> <a href="parsp_2.html#R1" target="_self">is_collinear</a>  &amp; not <font color="Maroon">c<sub>5</sub></font>,<font color="Maroon">c<sub>4</sub></font>,<font color="Maroon">c<sub>3</sub></font> <a href="parsp_2.html#R1" target="_self">is_collinear</a>  &amp; not <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="parsp_2.html#R1" target="_self">is_collinear</a>  &amp; not <font color="Maroon">c<sub>3</sub></font>,<font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>4</sub></font> <a href="parsp_2.html#R1" target="_self">is_collinear</a>  &amp; not <font color="Maroon">c<sub>3</sub></font>,<font color="Maroon">c<sub>4</sub></font>,<font color="Maroon">c<sub>2</sub></font> <a href="parsp_2.html#R1" target="_self">is_collinear</a>  &amp; not <font color="Maroon">c<sub>4</sub></font>,<font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>3</sub></font> <a href="parsp_2.html#R1" target="_self">is_collinear</a>  &amp; not <font color="Maroon">c<sub>4</sub></font>,<font color="Maroon">c<sub>3</sub></font>,<font color="Maroon">c<sub>2</sub></font> <a href="parsp_2.html#R1" target="_self">is_collinear</a>  &amp; not <font color="Maroon">c<sub>3</sub></font>,<font color="Maroon">c<sub>5</sub></font>,<font color="Maroon">c<sub>2</sub></font> <a href="parsp_2.html#R1" target="_self">is_collinear</a>  &amp; not <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>3</sub></font>,<font color="Maroon">c<sub>5</sub></font> <a href="parsp_2.html#R1" target="_self">is_collinear</a>  &amp; not <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>5</sub></font>,<font color="Maroon">c<sub>3</sub></font> <a href="parsp_2.html#R1" target="_self">is_collinear</a>  &amp; not <font color="Maroon">c<sub>5</sub></font>,<font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>3</sub></font> <a href="parsp_2.html#R1" target="_self">is_collinear</a>  &amp; not <font color="Maroon">c<sub>5</sub></font>,<font color="Maroon">c<sub>3</sub></font>,<font color="Maroon">c<sub>2</sub></font> <a href="parsp_2.html#R1" target="_self">is_collinear</a>  &amp; not <font color="Maroon">c<sub>4</sub></font>,<font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>5</sub></font> <a href="parsp_2.html#R1" target="_self">is_collinear</a>  &amp; not <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>4</sub></font>,<font color="Maroon">c<sub>5</sub></font> <a href="parsp_2.html#R1" target="_self">is_collinear</a>  &amp; not <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>5</sub></font>,<font color="Maroon">c<sub>4</sub></font> <a href="parsp_2.html#R1" target="_self">is_collinear</a>  &amp; not <font color="Maroon">c<sub>5</sub></font>,<font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>4</sub></font> <a href="parsp_2.html#R1" target="_self">is_collinear</a>  &amp; not <font color="Maroon">c<sub>5</sub></font>,<font color="Maroon">c<sub>4</sub></font>,<font color="Maroon">c<sub>2</sub></font> <a href="parsp_2.html#R1" target="_self">is_collinear</a>  &amp; not <font color="Maroon">c<sub>5</sub></font>,<font color="Maroon">c<sub>3</sub></font>,<font color="Maroon">c<sub>4</sub></font> <a href="parsp_2.html#R1" target="_self">is_collinear</a>  &amp; not <font color="Maroon">c<sub>3</sub></font>,<font color="Maroon">c<sub>4</sub></font>,<font color="Maroon">c<sub>5</sub></font> <a href="parsp_2.html#R1" target="_self">is_collinear</a>  &amp; not <font color="Maroon">c<sub>3</sub></font>,<font color="Maroon">c<sub>5</sub></font>,<font color="Maroon">c<sub>4</sub></font> <a href="parsp_2.html#R1" target="_self">is_collinear</a>  &amp; not <font color="Maroon">c<sub>4</sub></font>,<font color="Maroon">c<sub>3</sub></font>,<font color="Maroon">c<sub>5</sub></font> <a href="parsp_2.html#R1" target="_self">is_collinear</a>  &amp; not <font color="Maroon">c<sub>4</sub></font>,<font color="Maroon">c<sub>5</sub></font>,<font color="Maroon">c<sub>3</sub></font> <a href="parsp_2.html#R1" target="_self">is_collinear</a>  )
 <b>by </b><i><a class="txt" href="parsp_2.html#E2:43"><i><font color="Green">E35</font></i></a>, <a class="txt" href="parsp_2.html#E3:43"><i><font color="Green">E36</font></i></a>, <a class="txt" href="parsp_2.html#E4:43"><i><font color="Green">E37</font></i></a>, <a class="ref" href="parsp_2.html#T15" target="_self">Th15</a></i>;<br/>


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