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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.
I'm not sure this solution even works.. there are more subtraction going on than described.. and why would you go through every edge case instead of applying some logic of addition and subtraction?