What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_9, x_9 is a police officer. For all x_9, x_9 is a server or x_9 is not a doctor. For all x_9, x_9 is an artist. For all x_9, if x_9 were an artist, then x_9 is a doctor.
For all x_9, x_9 is a doctor. For all x_9, x_9 is a police officer and x_9 is an artist. For all x_9, x_9 is an artist and x_9 is a police officer. For all x_9, if x_9 were a doctor, then x_9 is a server.