What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_8: P_8(x_8). forall x_8: P_8(x_8) -> R(x_8). forall x_8: ~R(x_8) or U(x_8). ~U_1(a_3).
forall x_8: R(x_8).