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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.
"Significantly" more difficult to the point where I don't think this is a 5kyu problem.
Very nice Kata, however, significantly more difficult then other 5kyu katas (assuming you do not precompute and save results in an array)