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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.
Clever use of for! This has to be the most efficient solution (except for using a global variable)
Why would you do this as opposed to v*v? Seems like crossing the river for water, or is there any benefits? :)
Very elegant!