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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 example in python suggest list of lists to be returned. Test case expecting tuple. There should be consistency. Just wasted few mintes to figure this out.