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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.
Doesn't clear from the Description, are these "Input constraints" for making checks (like in this solution) or just inform us what function will receive...
As the provided tests don't cover such cases - choose "less code is better" ;)