Consider the following premises. forall x_8: P_8(x_8) -> R_8(x_8). exists x_8: Q_8(x_8) -> R_8(x_8). forall x_8: P_8(x_8) or Q_8(x_8). forall x_8: W(x_8) -> ~R_8(x_8). Can we infer forall x_8: W(x_8) from them? If possible, name the inference rules being used at each step.
 From forall x_8: P_8(x_8) -> R_8(x_8), exists x_8: Q_8(x_8) -> R_8(x_8), forall x_8: P_8(x_8) or Q_8(x_8) we can infer exists x_8: R_8(x_8) via existential disjunction elimination. Finally, from forall x_8: W(x_8) -> ~R_8(x_8), exists x_8: R_8(x_8) we can infer exists x_8: ~W(x_8) via existential modus tollens, which contradicts forall x_8: W(x_8). Therefore, the answer is no.