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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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I think it should be (2..n-1), both 3 and 5 should be prime numbers
Was trying to recreate this and wondering why my code was returning the upper bound. Those pesky dots! Have to use 3 instead of 2 --this helped me confirm: https://stackoverflow.com/questions/9690801/difference-between-double-dot-and-triple-dot-in-range-generation