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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.
test case with "false_key" says it should return 'false', when it should return an error
It's not clear what to do when given an empty array with a sum greater than 0 vs a sum of 0