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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.
The question says 'a function that takes a list of non-negative integers'.
so there wouldn't be any array with negative numbers.
plus that I don't understand why u said in your exmaple it should return only 2 and 3. what about 3.5?