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