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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 little puzzle was "interesting" I would say, Congrats.
It is kinda sad that comment are disabled, but after reading some comment I understand why, I like to have some comment to explain logic and tips for other and even myself when looking back to my answers.