What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall y_1: R_2(y_1) -> P_4(y_1). exists y_1: ~R_2(y_1). forall y_1: T(y_1) -> R_2(y_1). forall y_1: U(y_1) <-> T(y_1). forall y_1: P_4(y_1) -> T(y_1).
exists y_1: ~T(y_1). forall y_1: R_2(y_1) -> T(y_1). forall y_1: T(y_1) -> P_4(y_1). forall y_1: P_4(y_1) -> R_2(y_1). forall y_1: U(y_1) -> T(y_1). forall y_1: T(y_1) -> U(y_1).