What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall y: ~U(y). exists y: Q(y) <-> Q_4(y). forall y: U(y) <-> Q_4(y).
forall y: U(y) -> Q_4(y). exists y: Q(y) -> Q_4(y). forall y: Q_4(y) -> U(y). exists y: Q_4(y) -> Q(y). forall y: ~Q_4(y).