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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.
This was more challenging then 7kyu for me personally, but I was specifically trying to use a recursive solution.
I got it, but the return for my base case was not so elegant imo... But I got it lol.
Great practice.