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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
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Try your code in another place like pythontutor see why it returns
Nonewith that input value.Print the input (it'll appear above the test result), for some value your function is not returning (the default value for Python is None).