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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.
You explicitly say that input will consist of only positive integers, and then give a case where it's not.
seems incomplete - question is poorly worded
Very simple, and no method signature to run tests. Seems incomplete.