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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.
FYI - Not sure what's going on, but I just tried your solution and it worked fine.
I don't know about the other five katas since I'm new here, but I enjoyed it. The explanation was clear, and the example made sense to me.
I'm not sure how you would know there are kata that preceeded your kata, but perhaps there's a search function or something. (Going to check now!)
Anyway, thanks!