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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.
fixed the problem with 0 sum. Which there was a way to do this without collecting to a list first.
my first attempt, depends on 0 not being a valid sum.