What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: forall x_6: P_6(x_6). exists x_6: ~Q_6(x_6) or R_3(x_6). forall x_6: ~P_2(x_6). forall x_6: ~P_6(x_6) or P_2(x_6).
Nothing can be inferred from these premises.