What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_17: P(x_17) -> ~R_17(x_17). forall x_17: P(x_17) <-> U_4(x_17). forall x_17: P_17(x_17) -> R_17(x_17). forall x_17: Q_17(x_17) -> R_17(x_17). exists x_17: P_17(x_17) or Q_17(x_17).
exists x_17: R_17(x_17). forall x_17: P(x_17) -> U_4(x_17). forall x_17: U_4(x_17) -> P(x_17).