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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.
The kata description examples MUST include an empty array.
Plus, if the code needs to validate if nil was given instead of an array, that should also be clarified in the kata description.