for (int i = 0; i < 3; i++){ for (int j = 0; j <3; j++){ int k = 0; int[] list = new int[9]; for (int row = i*3; row < i * 3 + 3; row ++) for(int column = j * 3; column < j * 3 + 3; column++) list[k++] = grid[row][column]; if (!is1To9(list)) return false; } } return true;
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