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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.
It does, but as that's not really supposed to happen, there's no reason to worry.
While it may be a good concern for production code, this is a coding challenge, so no reason to do more than needed.