Consider the following premises. For all x_14, if x_14 plays squash, then x_14 is taking a plane. For all x_14, x_14 will sleep. For all x_14, if x_14 sleeps, then x_14 is playing squash. Can we infer the following from them? If we can, name the inference rule being used: Richard is not taking a plane.
 From the fact that for all x_14, if x_14 sleeps, then x_14 is playing squash, and that for all x_14, x_14 will sleep we can infer that for all x_14, x_14 will play squash via universal modus ponens. Finally, from the fact that for all x_14, if x_14 plays squash, then x_14 is taking a plane, and that for all x_14, x_14 will play squash we can infer that for all x_14, x_14 will take a plane via universal modus ponens, which contradicts that Richard is not taking a plane. Therefore, the answer is no.