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