Consider the following premises. There is at least one x_14 for which x_14 will drink water if and only if x_14 is a police officer. For all x_14, x_14 is fast. For all x_14, x_14 is a police officer. Can we infer the following from them? There is at least one x_14 for which x_14 will drink water and x_14 is fast.
 From the fact that there is at least one x_14 for which x_14 will drink water if and only if x_14 is a police officer we can infer that there is at least one x_14 for which if x_14 were a police officer, then x_14 is drinking water. From the fact that there is at least one x_14 for which if x_14 were a police officer, then x_14 is drinking water, and that for all x_14, x_14 is a police officer we can infer that there is at least one x_14 for which x_14 will drink water. Finally, from the fact that there is at least one x_14 for which x_14 will drink water, and that for all x_14, x_14 is fast we can infer that there is at least one x_14 for which x_14 will drink water and x_14 is fast. Therefore, the answer is yes.