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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 needed but it's more clear that way.
This comment is hidden because it contains spoiler information about the solution
Thanks, I'll correct it!
This solution assumes that every second character is already lower-cased.
Try it with "AA" and see that you get "AA" instead of "Aa"