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    That was exactly it. Thank you!

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    Probably how your function is handling a negative number as input.

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    I have attempted to submit but get a failure on the 4th test: '' should equal None. I though this might be saying that an empty string for n (i.e. an invalid input) should return None but I got that working and it tested just fine. Could anyone offer insight into what that failure might indicate that they are testing against?