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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.
Not a kata issue! I've tested with my solution and it passed so it is likely you have selected a deprecated version, just reset the trainer will do! Also, your code is wrong as it reverses the whole text instead of reversing the order of invidual words!