What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? exists y: T_3(y) -> P(y). forall y: T_3(y) -> S_4(y). forall y: S_4(y) -> T_3(y).
exists y: S_4(y) -> P(y). forall y: T_3(y) <-> S_4(y). forall y: S_4(y) <-> T_3(y).