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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.
Very poor description, I didn't understand for a long time why I pass the initial tests, but I don't pass the final ones. But if you pay attention to the name of the function, you may guess what you need to do to perform it correctly.
Divine :)