What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? It is not sunny. If David drives a car, then it is sunny. For all x_9, x_9 will drive a car if and only if x_9 is an office clerk. If it is sunny, then David is driving a car.
David is not driving a car. For all x_9, if x_9 drives a car, then x_9 is an office clerk. For all x_9, if x_9 were an office clerk, then x_9 is driving a car.