What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall y_3: T_4(y_3) -> S_4(y_3). forall y_3: R_2(y_3) -> T_4(y_3). exists y_3: S_4(y_3) -> T_4(y_3). forall y_3: S_4(y_3) or R_2(y_3).
forall y_3: R_2(y_3) -> S_4(y_3). exists y_3: T_4(y_3). exists y_3: S_4(y_3) <-> T_4(y_3). exists y_3: T_4(y_3) <-> S_4(y_3).