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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.
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Great kata!
The test case is called "returns
[]if the list has only one element", not "returns[]if and only if the list has only one element".You have to return an empty list if and only if the list/array has zero or one element(s).
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?