What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x: Q(x) -> R_4(x). forall x: R_4(x) -> S_3(x). forall x: R_4(x) <-> Q(x).
forall x: Q(x) -> S_3(x). forall x: R_4(x) -> Q(x). forall x: Q(x) -> R_4(x).