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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.
Fair points, but it shouldn't be marked as "incorrect" since the requirements you've listed are not mentioned in the description.
The word you are looking for is 'innefficient' not 'incorrect'. After all it does pass the test cases.