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.
Find all elements less than 0 or greater than 10 and replace them with NaN
Omit columns averages from a matrix
Calculate the area of a triangle between three points
Sum the numbers on the main diagonal
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