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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.
This is a great answer if we're going for brevity, but if we broke out the reversal into a function and renamed 'rev' I think this would be a much more readable answer than dting's.