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, if x_8 drives a car, then x_8 is a police officer. For all x_8, x_8 is a police officer if and only if x_8 is a server. For all x_8, x_8 will drive a car or x_8 is a server. There is at least one x_8 for which x_8 will listen to a song.
For all x_8, if x_8 were a police officer, then x_8 is a server. For all x_8, if x_8 were a server, then x_8 is a police officer.