# A box with eight points in 2D, no attributes, one boundary marker. 8 2 0 1 # Outer box has these vertices: 1 0 0 0 2 0 3 0 3 3 0 0 4 3 3 33 # A special marker for this point. # Inner square has these vertices: 5 1 1 0 6 1 2 0 7 2 1 0 8 2 2 0 # Five segments with boundary markers. 5 1 1 1 2 5 # Left side of outer box. 2 5 7 0 # These four segments enclose the hole. 3 7 8 0 4 8 6 10 5 6 5 0 # One hole in the middle of the inner square. 1 1 1.5 1.5