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.
Back to basics 15 - Benchmark
Number of 1s in a binary string
Number of digits in an integer
07 - Common functions and indexing 2
Max of a Vector
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