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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.
I think you should force coders to check if numbers are valid(not negative), and maybe make the function return boolean.
Also you can mix the numbers up so coder has to sort them.