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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.
Yes, it seems that the requirements have changed since I submitted the above solution.
It fails when I rerun the tests now.
Admittedly it isn't very efficient for large ranges; I just wanted to see how short of a solution I could find.