Consider the following premises. Thomas is driving a car if and only if it is snowing. It is snowing or Thomas is not driving a car. Can we infer the following from them? If is not true that it is snowing if and only if Thomas is driving a car.
 From the fact that Thomas is driving a car if and only if it is snowing we can infer that if it snows, then Thomas is driving a car. From the fact that it is snowing or Thomas is not driving a car we can infer that if Thomas drives a car, then it is snowing. Finally, from the fact that if it snows, then Thomas is driving a car, and that if Thomas drives a car, then it is snowing we can infer that it is snowing if and only if Thomas is driving a car, which contradicts that If is not true that it is snowing if and only if Thomas is driving a car. Therefore, the answer is no.