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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.
It depends on how you treat replacement. If you count it as one operation, 'barrel' is different to 'beer' in 3 moves. (1 replacement and 2 removals)
However my interpretation could be wrong. I haven't complited this Kata yet. I'm still getting a failure on 7th test.