Can a solved Sudoku game have an invalid region if all rows and columns are valid? – math.stackexchange.com

Can a solved Sudoku game have an invalid region if all rows and columns are valid? – math.stackexchange.com

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Given a $9 \times 9$ Sudoku game with $3 \times 3$ regions, is it possible that one (or more) of the regions are invalid if all rows and columns are valid (i.e. have a unique sequence of $1-9$)?

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