What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Sarah is playing squash if and only if William is driving a car. Sarah is not playing squash. For all x_8, x_8 will drive a car or x_8 is fast.
If Sarah plays squash, then William is driving a car. If William drives a car, then Sarah is playing squash. William is not driving a car.