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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.
In JavaScript, the ['A', 'A', 'A', 'K', '4'] test is poorly written since, by the rules of the kata, it equals 16, but the test says it should be 17. I succeeded every other test but I had to hack the solution just so it could give 17 on that specific test case.