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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.
There's a typo in your example. It has 5 as the last digit in the returned array but really it should be 25.
Cool solution, does this actually execute faster than the more obvious algorithm?