Triangle Kata in Elixir using Erlang processes for Parallel Maps

Last time I described my setup for learning Elixir, the language built on top of Erlang with a Ruby bent.  Today I wanted to get a hang of processes and mailboxes which are so important to both languages.  To do this I chose the Triangle Kata as my background story.  Take a look:

Update: You might wonder what that slow function is all about. I added that in there to clarify the parallelism. You would expect the slowest classifications to appears at the end of the resultant list.