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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 wanted to tackle this problem using recursion, and in doing so, I discovered an extremely useful way to use python's built in pop function to support that effort! Great problem!