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  1. or download this
    my @points = ([1.0, 4.0],  [2.3, 0.7],  [3.6, 6.0],
                  [4.0, 3.6]);
    ...
                [a, b, c, 2,  3],
                [a, b, c, 2, -1],
                [a, b, c, 3, -1]);
    
  2. or download this
    my @points = ([1.0, 4.0],
                  [2.3, 0.7],
    ...
                [0, 1, 2, 5, 6, 8], # Poly 0 edges
                [1, 4, 5],          # Poly 1 edges
                [2, 6, 7] );        # Poly 2 edges