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.
Return the 3n+1 sequence for n
Multiply a column by a row
Matlab Basics II - Max & Index of Max
Verify Law of Large Numbers
PIN code III
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