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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.
The description should probably mention what happens in the case of [9] (i.e. adding an extra element); I guessed this was the case, but it's not in the description or the tests!