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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.
You should probably clarify your instructions. It's not clear that two different types of input of essentially the same thing (2 and '2') are not supposed to match. A lot of us just assumed that since they are the basically the same, they should match. Otherwise, pretty good kata.