What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_3: P_3(x_3) or R_4(x_3). forall x_3: ~R_4(x_3) or R(x_3). exists x_3: ~P_3(x_3) or R_3(x_3).
exists x_3: R_4(x_3) or R_3(x_3).