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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.
It only fails because they used division ('/') instead of floor division ('//') the one you need is explained in the instructions. The failures occur because it is expecting a result rounded down to the nearest whole number and is instead giving a decimal answer in certain tests.