It must have no duplicate points clause first and last point
Usages:
Then It must have no duplicate points including first and last point
GEM111 No duplicated points within a polyloop or polyline - v1:13
Then It must have no duplicate points including first and last point
GEM111 No duplicated points within a polyloop or polyline - v1:20
Then It must have no duplicate points excluding first and last point
GEM111 No duplicated points within a polyloop or polyline - v1:27