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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.
You return the result and None at the same time.
Failed asserting that null matches expected 15. - cant understand what the problem - code works in repl.it
Print the input.
You return
None
instead of the result.This comment is hidden because it contains spoiler information about the solution