Consider the following premises. For all x_1, if x_1 were a server, then x_1 is a musician. For all x_1, x_1 is a server. For all x_1, if x_1 were a musician, then x_1 is sad. Can we infer the following from them? If we can, name the inference rule being used: For all x_1, x_1 is sad.
 From the fact that for all x_1, if x_1 were a server, then x_1 is a musician, and that for all x_1, if x_1 were a musician, then x_1 is sad we can infer that for all x_1, if x_1 were a server, then x_1 is sad via universal transitivity. Finally, from the fact that for all x_1, if x_1 were a server, then x_1 is sad, and that for all x_1, x_1 is a server we can infer that for all x_1, x_1 is sad via universal modus ponens. Therefore, the answer is yes.