Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. Outside digits must be inserted in the corresponding row or column of the contiguos box.

Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. Outside digits must be inserted in the corresponding row or column of the contiguos box.