Consider the following premises. For all x_4, x_4 will make tea if and only if x_4 is a scientist. For all x_4, x_4 will make tea if and only if x_4 is an artist. For all x_4, x_4 is not a scientist. Can we infer the following from them? For all x_4, x_4 is not an artist.
 From the fact that for all x_4, x_4 will make tea if and only if x_4 is a scientist, and that for all x_4, x_4 is not a scientist we can infer that for all x_4, x_4 will not make tea. From the fact that for all x_4, x_4 will make tea if and only if x_4 is an artist we can infer that for all x_4, if x_4 were an artist, then x_4 is making tea. Finally, from the fact that for all x_4, if x_4 were an artist, then x_4 is making tea, and that for all x_4, x_4 will not make tea we can infer that for all x_4, x_4 is not an artist. Therefore, the answer is yes.