Consider the following premises. There is at least one x_4 for which if x_4 were a musician, then x_4 is working. For all x_4, if x_4 plays tennis, then x_4 is a musician. For all x_4, if x_4 works, then x_4 is playing tennis. Can we infer the following from them? There is at least one x_4 for which if x_4 works, then x_4 is playing tennis.
 From the fact that for all x_4, if x_4 plays tennis, then x_4 is a musician, and that there is at least one x_4 for which if x_4 were a musician, then x_4 is working we can infer that there is at least one x_4 for which if x_4 plays tennis, then x_4 is working. From the fact that there is at least one x_4 for which if x_4 plays tennis, then x_4 is working, and that for all x_4, if x_4 works, then x_4 is playing tennis we can infer that there is at least one x_4 for which x_4 will play tennis if and only if x_4 will work. Finally, from the fact that there is at least one x_4 for which x_4 will play tennis if and only if x_4 will work we can infer that there is at least one x_4 for which if x_4 works, then x_4 is playing tennis. Therefore, the answer is yes.