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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.
Why is this particular exercise in 8 kyu? Definitely not an "easiest" coding problem. I think of easiest as very beginner type of functions and 7 kyu as stretching the easiest to figure out to include an extra step or two.