Consider the following premises. For all x_9, x_9 is a taxi driver or x_9 is a server. For all x_9, x_9 will write a letter or x_9 will play squash. For all x_9, if x_9 writes a letter, then x_9 is running. For all x_9, x_9 is not a taxi driver. For all x_9, if x_9 plays squash, then x_9 is running. Can we infer the following from them? If we can, name the inference rule being used: Charles is not a server.
That contradicts the premises. Therefore the answer is no.