What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Linda is not driving a car. If Linda drives a car, then David is a police officer. If David were a police officer, then Linda is driving a car.
David is not a police officer. Linda is driving a car if and only if David is a police officer. David is a police officer if and only if Linda is driving a car.