Consider the following premises. For all x_9, x_9 is a police officer or x_9 will not write a letter. For all x_9, x_9 will write a letter or x_9 is not a police officer. Can we infer the following from them? If we can, name the inference rule being used: The fact that James writes a letter does not imply that James is a police officer.
That contradicts the premises. Therefore the answer is no.