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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 need to declare
sum
andi
withvar
; as is, this spills them out as globals.If Coffee/JS had a proper zip function this would look better.