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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.
With an empty string it returns true, yes. That might seem counter intuitive in regards of the kata's description, but it is what the tests expect when no g is found at all, see e.g.: ("A half of a half is a quarter.", true)