What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_8, x_8 will write a letter if and only if x_8 is a server. There is at least one x_8 for which x_8 will write a letter if and only if x_8 will drive a car.
For all x_8, if x_8 writes a letter, then x_8 is a server. There is at least one x_8 for which if x_8 writes a letter, then x_8 is driving a car. For all x_8, if x_8 were a server, then x_8 is writing a letter. There is at least one x_8 for which if x_8 drives a car, then x_8 is writing a letter.