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