What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If Thomas drives a car, then it is cloudy. Thomas is driving a car if and only if Charles is climbing a mountain. It is not cloudy. If it is cloudy, then Thomas is driving a car.
Thomas is not driving a car. Thomas is driving a car if and only if it is cloudy. It is cloudy if and only if Thomas is driving a car. If Thomas drives a car, then Charles is climbing a mountain. If Charles climbs a mountain, then Thomas is driving a car.