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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.
After struggling for a while I looked at your solution. Mine was exactly the same except I was missing 'i--' and so couldn't delete all instances of b from a. Still not sure I understand how 'i--' allows you to remove them all. Could you explain? Thanks