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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.
Sure, it's there, but it's very easy to miss. No harm in making it more clear, right?
I think the description should changed to explicitly state that your code should consider "n" itself when returning the largest number. It's very frustrating to write a solution that passes all of the initial tests, and then fails on some of the random tests - especially for newer programmers.