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