Sudoku Month 2 (Soduku for the holiday)

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The rules of Sudoku are very simple: A board with nine rows, nine columns and nine sub squares. On this board, some numbers from 1 to 9 are pre-inserted. From here, you have to find the rest of the missing numbers from 1 to 9, which must appear only once in each line, column and subframe. Thanks to these guidelines you will start playing Sudoku and will not be able to stop.