Consider the following premises. There is at least one x_6 for which x_6 will take a plane or x_6 will write a letter. For all x_6, x_6 will write a letter if and only if x_6 is a lawyer. For all x_6, if x_6 were a server, then x_6 is a lawyer. For all x_6, x_6 will not take a plane or x_6 is a server. Can we infer the following from them? There is at least one x_6 for which x_6 is a lawyer.
 From the fact that for all x_6, x_6 will write a letter if and only if x_6 is a lawyer we can infer that for all x_6, if x_6 writes a letter, then x_6 is a lawyer. From the fact that there is at least one x_6 for which x_6 will take a plane or x_6 will write a letter, and that for all x_6, x_6 will not take a plane or x_6 is a server we can infer that there is at least one x_6 for which x_6 will write a letter or x_6 is a server. Finally, from the fact that for all x_6, if x_6 writes a letter, then x_6 is a lawyer, that for all x_6, if x_6 were a server, then x_6 is a lawyer, and that there is at least one x_6 for which x_6 will write a letter or x_6 is a server we can infer that there is at least one x_6 for which x_6 is a lawyer. Therefore, the answer is yes.