What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? exists y: Q_3(y) -> U(y). forall y: Q_3(y) <-> U(y). forall y: T_3(y) -> U(y).
forall y: Q_3(y) -> U(y). forall y: U(y) -> Q_3(y).