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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.
Seems like the kata should tell you that you are supposed to do this. Also it neglects to tell you that you have to take into account just calling the function without a parameter. That should have been specified as well in the description.