What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall y: S_3(y) -> U(y). forall y: U(y) -> S_3(y). exists y: U(y) -> T_2(y).
exists y: S_3(y) -> T_2(y). forall y: S_3(y) <-> U(y). forall y: U(y) <-> S_3(y).