In Erlang, is there a way to pattern match against an enumerated set of atoms?

I'm currently picking up Erlang, and its pattern matching is one of the coolest things I've seen in awhile. One little toy function I've come up with in my exercises is as follows: b_and(true, true) -> true; b_and(true, false) -> false; b_and(false, true) -> false; b_and(false, false) -> false; b_and(_, _) -> {error, invalid_object}. I was wondering, though, is there syntax for telling a Variable