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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.
Oh, I remember that: it was put on purpose to force users to clean up the input from ending
/s.I fear I don't have much control over it; and yet I wonder why you got an error for that.