Consider the following premises. For all x_12, if x_12 were an artist, then x_12 is an office clerk. For all x_12, if x_12 drinks water, then x_12 is not an office clerk. For all x_12, x_12 is an astronaut. For all x_12, x_12 is an artist if and only if x_12 is an astronaut. Can we infer the following from them? For all x_12, x_12 will not drink water.
 From the fact that for all x_12, x_12 is an artist if and only if x_12 is an astronaut we can infer that for all x_12, if x_12 were an astronaut, then x_12 is an artist. From the fact that for all x_12, if x_12 were an astronaut, then x_12 is an artist, and that for all x_12, x_12 is an astronaut we can infer that for all x_12, x_12 is an artist. From the fact that for all x_12, if x_12 were an artist, then x_12 is an office clerk, and that for all x_12, x_12 is an artist we can infer that for all x_12, x_12 is an office clerk. Finally, from the fact that for all x_12, if x_12 drinks water, then x_12 is not an office clerk, and that for all x_12, x_12 is an office clerk we can infer that for all x_12, x_12 will not drink water. Therefore, the answer is yes.