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.
Remove all the consonants
Sort a list of complex numbers based on far they are from the origin.
Basics: 'Find the eigenvalues of given matrix
Volume of a box
Return multiples of 3
Insert zeros II
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