Consider the following premises. For all z_3, z_3 will play squash or z_3 will not take a plane. For all z_3, z_3 is a doctor or z_3 will take a plane. For all z_3, if z_3 were a doctor, then z_3 is playing squash. Can we infer the following from them? If we can, name the inference rule being used: For all z_3, z_3 will play squash.
 From the fact that for all z_3, z_3 will play squash or z_3 will not take a plane we can infer that for all z_3, if z_3 takes a plane, then z_3 is playing squash via universal rewriting. Finally, from the fact that for all z_3, if z_3 were a doctor, then z_3 is playing squash, that for all z_3, if z_3 takes a plane, then z_3 is playing squash, and that for all z_3, z_3 is a doctor or z_3 will take a plane we can infer that for all z_3, z_3 will play squash via universal disjunction elimination. Therefore, the answer is yes.