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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.
Very nice challenge, thank you for the kata. For the longest time I thought the edge case involved a number going out of the range [-1000000, 1000000], but it appears no test case actually checks for this (correct me if I'm wrong). Perhaps remove the range from the description? In my experience it did not contribute towards solving the challenge (C#).