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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.
Both Python and JS version needs better handling inside the transition function. Passing in unexpected values just throws an exception.
Why does JS version have completely different transition function return format? Language versions should have the same mechanism whenever possible.