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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.
Because of the check code. I just spent about 30 minutes trying to figure this out - The types of the two check codes appear to be different so I had to use === rather than == to check them. Then it worked.