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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.
Are you certain that the test cases are correct? My solution is correct for every range or single year that I've tried, but when I submit my solution it says the value doesn't match the expected value.