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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.
Hard to say, since that scenario isn't covered in the requirements or the test cases. I'm honestly not sure what the original writer of the kata would consider the "correct" solution for something like "UK".
Beware that this fails for "UK" for instance.