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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.
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I belive this shouldn't pass because it sums all values, not the values of two passed keys to the function. Perhaps the Kata Test Cases should be improved?
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Do I need to guess or what? this is not well explained, needs to point out how the words should contain