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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 task is wrongly framed, it doesn't say anything about the use of sets (which turns the task into a joke) or standard array functions in different languages simplifying this task