What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Sarah is driving a car if and only if it is raining. Elisabeth is playing squash if and only if Joseph is climbing a mountain. It is not raining. Sarah is driving a car if and only if Joseph is climbing a mountain.
If Sarah drives a car, then it is raining. If Elisabeth plays squash, then Joseph is climbing a mountain. If Sarah drives a car, then Joseph is climbing a mountain. If it rains, then Sarah is driving a car. If Joseph climbs a mountain, then Elisabeth is playing squash. If Joseph climbs a mountain, then Sarah is driving a car. Sarah is not driving a car.