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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.
It took me some time to understand that given nested list should not be modified in the process. I think a clear mentioning of such requirement should be provided in the task section.