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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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This is by far the best solution, I think. Maybe not in spirt of the problem, but it's hard to beat the standard library. Also, recursives solutions have their limits in python.