What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_3: S_1(x_3) <-> Q(x_3). forall x_3: Q(x_3) <-> S_1(x_3).
forall x_3: S_1(x_3) -> Q(x_3). forall x_3: Q(x_3) -> S_1(x_3). forall x_3: Q(x_3) -> S_1(x_3). forall x_3: S_1(x_3) -> Q(x_3).