Please add more cases to the test suite, or else it is trivial to solve this problem.
Rafael is right and since you made this into a badge problem it is even more essential to fix this
Flip the main diagonal of a matrix
Get the length of a given vector
Make a vector of prime numbers
2倍してみよう - ここからスタート！
Deleting an element in a matrix
Find Logic 21
Find square of given number
Find Logic 1
Find Logic 6
Find Logic 29
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