[4, 0, 0,  0, 0, 9,  0, 8, 0,
        0, 0, 0,  8, 0, 0,  2, 3, 4,
        0, 5, 3,  4, 2, 0,  0, 0, 0,

        0, 8, 0,  3, 0, 1,  7, 9, 0,
        5, 0, 0,  7, 0, 2,  0, 0, 6,
        0, 7, 1,  6, 0, 5,  0, 4, 0,

        0, 0, 0,  0, 6, 8,  4, 7, 0,
        9, 3, 7,  0, 0, 4,  0, 0, 0,
        0, 4, 0,  5, 0, 0,  0, 0, 1]