[
                [1 * 5 + 2 * 6 + 4 * 8 + 5 * 9],
                [1 * 4 + 2 * 5 + 3 * 6 + 4 * 7 + 5 * 8 + 6 * 9],
                [2 * 4 + 3 * 5 + 5 * 7 + 6 * 8],