A problem must detail what needs to be done in its description. There is not only one way to do what's requested. You should probably add more test cases too, at least 5, to avoid lookup table solutions.
Flip the main diagonal of a matrix
Generate a vector like 1,2,2,3,3,3,4,4,4,4
The Answer to Life, the Universe, and Everything
subtract central cross
Verify Law of Large Numbers
matrix rows and columns
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