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