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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.
This kata is extremely misleading in ruby since the sample tests pass, but the hidden tests do not. The details just says fix the bugs, yet you have no idea what is supposed to be returned from the sample tests which all work.