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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.
I don't think so. Your solution seems perfect to me. Have you got any problem in passing tests?
By looking at your code I learned that in the str.startswith() function, prefix can also be a tuple of prefixes to look for... I'm amazed!