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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.
Nice one! At first I was struggling with correct recursion idea (now I see I could have simplified it even more), but after a while it was all about correcting edge cases, a real test driven development i'd say :)