What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_2: ~U_4(x_2). forall x_2: S(x_2) -> Q_2(x_2). exists x_2: Q_2(x_2) -> U_4(x_2).
exists x_2: ~Q_2(x_2). exists x_2: S(x_2) -> U_4(x_2).