Consider the following premises. For all x_11, x_11 will take a plane if and only if x_11 will play squash. For all x_11, if x_11 were excited, then x_11 is a doctor. For all x_11, x_11 is a bartender if and only if x_11 will play squash. For all x_11, x_11 is not a bartender. For all x_11, if x_11 were a doctor, then x_11 is taking a plane. Can we infer the following from them? For all x_11, x_11 is not excited.
 From the fact that for all x_11, x_11 is a bartender if and only if x_11 will play squash, and that for all x_11, x_11 is not a bartender we can infer that for all x_11, x_11 will not play squash. From the fact that for all x_11, x_11 will take a plane if and only if x_11 will play squash, and that for all x_11, x_11 will not play squash we can infer that for all x_11, x_11 will not take a plane. From the fact that for all x_11, if x_11 were a doctor, then x_11 is taking a plane, and that for all x_11, x_11 will not take a plane we can infer that for all x_11, x_11 is not a doctor. Finally, from the fact that for all x_11, if x_11 were excited, then x_11 is a doctor, and that for all x_11, x_11 is not a doctor we can infer that for all x_11, x_11 is not excited. Therefore, the answer is yes.