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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.
I agree - was feeling not good with making the code wich works to pass tests but breaks the task description.
So was need to change my solution to fit tests not to solve the problem.