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.
Times 2 - START HERE
Make one big string out of two smaller strings
Find nth maximum
UICBioE240 problem 1.15
find the answer
Return multiples of 3
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