What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? P(i_1) -> p. forall x: R_3(x) -> P(x). forall x: P(x) -> R_3(x).
forall x: R_3(x) <-> P(x). forall x: P(x) <-> R_3(x).