Payam, this is a good puzzle, but the code in the template and the test suite gives away the answer. I suggest removing the code from the template and checking the validity of the answer by applying the rules to rows, columns, and 3x3 squares.
Is my wife right? Now with even more wrong husband
Back to basics 7 - Equal NaNs
Cell Counting: How Many Draws?
Matlab Basics - Rounding I
Speed of car
PIN code III
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