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