What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? exists y: ~P_3(y). forall y: S(y) -> P_3(y). forall y: S(y) -> P_1(y). forall y: P_1(y) -> S(y).
exists y: ~S(y). forall y: P_1(y) -> P_3(y). forall y: S(y) <-> P_1(y). forall y: P_1(y) <-> S(y).