What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x: R_2(x) -> W(x). forall x: W(x) -> R_2(x). exists x: R_2(x) <-> Q(x).
forall x: R_2(x) <-> W(x). forall x: W(x) <-> R_2(x). exists x: R_2(x) -> Q(x). exists x: Q(x) -> R_2(x).