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Linear Ring, but not planar <math>P_4=(2,4,0)</math></td>
 
Linear Ring, but not planar <math>P_4=(2,4,0)</math></td>
 
<td width="33%">
 
<td width="33%">
No Linear Ring: all 3 points are co-linear <math>P_1=(2,2,1)</math>; self-intersection (see (iii))
+
No Linear Ring: all 3 points are co-linear; self-intersection (see (iii))
 
</td>
 
</td>
 
   
 
   

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