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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.
Is any of this new?
Finding the next greater number with the same digits has been done, and reversing things is mentioned specifically as "well represented", i.e. done to death. And no, returning an array isn't new either.
So what's new enough to warrant a new kata?