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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.
It really just took one minute haha. I didn't have the skills to takle the problem in a different way.
After seeing other solutions I would probably go with something involvig Data.Map. That's the beauty of this, learning by comparison.
It may not be clever at all but no doubt the code is very comprehensive. f is just the funtion that maps a caracter to it's rot13 version.