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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.
Quickly looking I don't see the ordering enforced in most of the solutions. It just happens by luck that the small amount of rows is scanned in the same order every time. Maybe you should randomize the selection of the test data to force more thinking on the final ordering.