What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Linda is cooking if and only if David is driving a car. Linda is not cooking. If it doesn't snow, then Karen is a scientist. David is driving a car if and only if it is snowing.
If Linda cooks, then David is driving a car. If David drives a car, then it is snowing. If David drives a car, then Linda is cooking. If it snows, then David is driving a car. David is not driving a car.