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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.
Nice and concise. This solution returns the correct answer if input is valid. However, per instructions invalid input should return 0. This solution throws an error on non-int arguments.
For this particular task - YAGNI