What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall y: R_1(y) <-> P_3(y). forall y: R_1(y) <-> U(y). forall y: U(y) <-> Q(y). forall y: ~Q(y). forall y: P_3(y) -> S(y). forall y: S(y) -> P_3(y).
forall y: P_3(y) <-> S(y). forall y: S(y) <-> P_3(y). forall y: R_1(y) -> P_3(y). forall y: R_1(y) -> U(y). forall y: U(y) -> Q(y). forall y: P_3(y) -> R_1(y). forall y: U(y) -> R_1(y). forall y: Q(y) -> U(y). forall y: ~U(y).