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.
given 3 sides, find area of this triangle
Make a random, non-repeating vector.
Test Problem; Create a 5x5 array containing all ones
Sum the squares of numbers from 1 to n
Insert zeros II
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