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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.
BTW, I have plenty of Kata where I disagree with the assigned rank, but it is the approver who determines the rank, not the author
Well, that's your opinion, could you be the one mistaken? IMHO 8 kyu is fine for what you have to do, it's a bug fixing kata, you only need to read the docs and apply what's there here.