0 1 2 3 4 3 2 1 1 0 1 2 3 4 3 2 2 1 0 1 2 3 4 3 3 2 1 0 1 2 3 4 4 3 2 1 0 1 2 3 3 4 3 2 1 0 1 2 2 3 4 3 2 1 0 1 1 2 3 4 3 2 1 0