Consider the following premises. For all x_16, x_16 is a janitor or x_16 is a mechanic. For all x_16, if x_16 were a mechanic, then x_16 is listening to a song. John is driving a car. For all x_16, if x_16 were a janitor, then x_16 is listening to a song. For all x_16, x_16 is a server. Can we infer the following from them? Mary is a server and John is driving a car.
 From the fact that for all x_16, if x_16 were a janitor, then x_16 is listening to a song, that for all x_16, if x_16 were a mechanic, then x_16 is listening to a song, and that for all x_16, x_16 is a janitor or x_16 is a mechanic we can infer that for all x_16, x_16 will listen to a song. From the fact that for all x_16, x_16 is a server, and that for all x_16, x_16 will listen to a song we can infer that for all x_16, x_16 is a server and x_16 will listen to a song. From the fact that for all x_16, x_16 is a server and x_16 will listen to a song we can infer that Mary is a server and Mary is listening to a song. From the fact that Mary is a server and Mary is listening to a song we can infer that Mary is a server. Finally, from the fact that Mary is a server, and that John is driving a car we can infer that Mary is a server and John is driving a car. Therefore, the answer is yes.