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