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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.
had to dig down quite a way to find a similar solution as mine :D
lol this was my solution as well (without the access modifiers), and I did it offline, neat
Cool, clever use of recursion, but I would object putting this into production.