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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.
Other people have mentioned the empty string. I was pulling my hair out trying to optimize my code until I realized the timeout I was getting was because I was't handling it. Perhaps handing this as input could be clearer? Maybe that is just my lack of experience.