What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If it snows, then it is raining. If Barbara reads a book, then James is excited. If James were excited, then it is snowing. If it rains, then William is driving a car.
If it snows, then William is driving a car. If Barbara reads a book, then it is snowing. If James were excited, then it is raining.