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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.
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As a musician, it's strange to use both flat and sharp in one song. Additionally, you may have to make it clear that why ['Db'] -> -4 steps -> ['A#'], for it should be 'Gb' instead. Btw, it's a great Kata and I'm looking forward to see more music-relative practices here.
To anyone who's confused by the description: the real difficulty in this kata is to observe how the process work.
It might have to take some time, but not difficult.
Just remember, every signal process is not necessary the same.
Good luck warriors!