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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 doesn't check for this type of incrementing for some reason, so while ABCDEF does fail, AAAAAA, AAAAAB etc does not.
How is this working? Doesn't it have to be unique?