What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? exists x_8: W(x_8) -> ~U(x_8). forall x_8: R_4(x_8) -> U(x_8). forall x_8: R_4(x_8) or P_1(x_8). forall x_8: U(x_8) <-> P_1(x_8).
forall x_8: U(x_8) -> P_1(x_8). forall x_8: P_1(x_8) -> U(x_8).