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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.
Maybe I'm reading the rules wrong, but it seems that the Kata is off in its testing. It's saying it expects s-words to start before d-words which definitely is not regular sort.