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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 could simplify a couple things if you imported Control.Arrow instead of bifunctor. Like the
bimap...part withjoin (***) (minimum &&& maximum) $ unzip alive.Using the indices seems to shorten the code quite a bit, though.