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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.
You don't need to do it at all, the answer can be computed with simple math.
Doesn't seem wise to iterate over the list three times when you only need to do it once.