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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.
Good point
While the solution is quite clever, it's not the most readable piece ever, at least for me.
Oh, cool change. :)
Cool to use reduce here, but Enum also offers a sum function, so you don't have to implement it.