What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall y: R(y) -> Q(y). forall y: Q(y) -> S_1(y). forall y: R(y) <-> S_1(y).
forall y: R(y) -> S_1(y). forall y: R(y) -> S_1(y). forall y: S_1(y) -> R(y).