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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.
I appreciate this solution, but when I attempted the +1 Array challenge for my 2nd time, I pretty much copied and pasted what you did. Upon executing it, I saw that 3 test cases failed and I couldn't figure out how to remedy this despite my best efforts.