What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_9: S_3(x_9) <-> S_9(x_9). S_3(a_9) -> S_9(a_9).
forall x_9: S_3(x_9) -> S_9(x_9). forall x_9: S_9(x_9) -> S_3(x_9).