What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x: U(x) -> S_2(x). exists x: Q(x) -> S_1(x). forall x: S_1(x) -> U(x). forall x: Q(x).
exists x: S_1(x). forall x: S_1(x) -> S_2(x). exists x: Q(x) -> U(x).