0.0 0.0 0.0 1.0 1.0 1.0 1 2 3 4 5 6 7 8 8 9 10 11 12 13 14 15 0 0 0 1 1 1 2 2 2 1 2 0 3 4 0 0 0 0 5 6 0 7 8 9 0 10 11 0 0 0 0 12 13 0 14 15