What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? There is at least one x_18 for which if x_18 plays squash, then x_18 is sleeping. For all x_18, if x_18 were a server, then x_18 is driving a car. For all x_18, if x_18 were a server, then x_18 is not sleeping. For all x_18, if x_18 drives a car, then x_18 is a server. For all x_18, if x_18 were a police officer, then x_18 is sleeping. For all x_18, x_18 is a police officer or x_18 will play squash.
There is at least one x_18 for which x_18 will sleep. For all x_18, x_18 is a server if and only if x_18 will drive a car. For all x_18, x_18 will drive a car if and only if x_18 is a server.