Haskell Fundamentals - Pointfree Style

This topic is for the [Pointfree Style][] exercise in the [Haskell Fundamentals][] trail. Post any questions, corrections, or pointers you have to share with other Upcase subscribers.
[Pointfree Style]: https://exercises.upcase.com/exercises/pointfree-style
[Haskell Fundamentals]: https://thoughtbot.com/upcase/haskell-fundamentals