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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.
A year after, have you found what this message is about ? I am in the same situation right now.
Yeah, I missed this for ages, as my algorithm was outputting "14-15". It would be nice if the test showed what the expected output should be.