Took me a second to figure out that this wasn&#x27;t a tutorial in itself, but meant as a companion to another erlang book or class, specifically Simon St. Laurent&#x27;s Introducing Erlang.<p>From the author:<p>&quot;As I continued writing my own examples, I thought they might be useful to other people as well. I contacted Simon St. Laurent, the author of Introducing Erlang, and he liked the idea of having these companion exercises and suggested naming them études&quot;