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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.
it is imortant that there are simple katas for beginner
Yes, return None.
Your code is the problem, not the kata. The kata works fine, as you can see.
Broken how?