Consider the following premises. For all x_10, x_10 will make tea. For all x_10, x_10 will make tea if and only if x_10 is a lawyer. There is at least one x_10 for which x_10 will drink water if and only if x_10 is a lawyer. Can we infer the following from them? There is at least one x_10 for which x_10 is a lawyer.
 From the fact that there is at least one x_10 for which x_10 will drink water if and only if x_10 is a lawyer we can infer that there is at least one x_10 for which if x_10 drinks water, then x_10 is a lawyer. From the fact that for all x_10, x_10 will make tea we can infer that for all x_10, x_10 will make tea or x_10 will drink water. From the fact that for all x_10, x_10 will make tea if and only if x_10 is a lawyer we can infer that for all x_10, if x_10 makes tea, then x_10 is a lawyer. Finally, from the fact that for all x_10, if x_10 makes tea, then x_10 is a lawyer, that there is at least one x_10 for which if x_10 drinks water, then x_10 is a lawyer, and that for all x_10, x_10 will make tea or x_10 will drink water we can infer that there is at least one x_10 for which x_10 is a lawyer. Therefore, the answer is yes.