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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 like this. One minor tweak here would be to start
Rangeat1instead of0since0will never contribute to a sum, but that just saves you one iteration.