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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.
Great kata!
In the task description, you specify "If you get an empty array/list, return an empty array/list." This is not consistent with the test case "returns [] if the list has only one element." Which is it, an ampty list or a list with one element?