What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? R_9(h) -> S_9(h). forall x_9: R_9(x_9) <-> S_9(x_9).
forall x_9: R_9(x_9) -> S_9(x_9). forall x_9: S_9(x_9) -> R_9(x_9).