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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.
You're probably mutating the input and then the error message seems wrong. I've created an issue about that 6 months ago.
Can you tell me when a board would be valid?Yes, you're mutating the input.
Thanks. Ranking can't be changed once Kata out of Beta unfortunately.