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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.
Which language are you talking about? In javascript there is a test with that input that only checks you return an array of length 3. But there are other tests that test the order. BTW, read this: https://www.codewars.com/kata/5558cc216a7a231ac9000022/discuss#5d16601a17c87800297a78e1