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Contravariant Coyoneda
https://github.com/scalaz/scalaz/blob/scalaz-seven/example/src/main/scala/scalaz/example/ContravariantCoyonedaUsage.scala https://github.com/typelevel/cats/blob/master/free/src/main/scala/cats/free/ContravariantCoyoneda.scala http://hackage.haskell.org/package/kan-extensions/docs/Data-Functor-Contravariant-Coyoneda.html