Consider the following premises. For all x_1, x_1 will make tea if and only if x_1 is a police officer. For all x_1, if x_1 makes tea, then x_1 is rich. For all x_1, x_1 is not rich. Can we infer the following from them? There is at least one x_1 for which x_1 is a police officer.
 From the fact that for all x_1, if x_1 makes tea, then x_1 is rich, and that for all x_1, x_1 is not rich we can infer that for all x_1, x_1 will not make tea. Finally, from the fact that for all x_1, x_1 will make tea if and only if x_1 is a police officer, and that for all x_1, x_1 will not make tea we can infer that for all x_1, x_1 is not a police officer, which contradicts that There is at least one x_1 for which x_1 is a police officer. Therefore, the answer is no.