The original number puzzle

Classic Sudoku

Fill a 9x9 grid so every row, column, and 3x3 box contains the numbers 1 through 9.

1. Use each number from 1 through 9 once in every row.
2. Use each number from 1 through 9 once in every column.
3. Use each number from 1 through 9 once in every 3x3 box.

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