What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x: S(x) <-> P_3(x). exists x: S(x) <-> P_3(x).
forall x: S(x) -> P_3(x). exists x: S(x) -> P_3(x). forall x: P_3(x) -> S(x). exists x: P_3(x) -> S(x).