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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.
Any submission throws "Unknown Error", even when I pasted passed solutions passed solutions.
I was training in JS version. I guess something wrong with the setup code of this kata.