What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall y: R(y) <-> S_1(y). forall y: T(y) <-> P(y). exists y: T(y) <-> R(y). forall y: ~P(y).
forall y: R(y) -> S_1(y). forall y: T(y) -> P(y). exists y: T(y) -> R(y). forall y: S_1(y) -> R(y). forall y: P(y) -> T(y). exists y: R(y) -> T(y). forall y: ~T(y).