What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: If it rains, then it is snowing. If it rains, then James is not driving a car. It is snowing if and only if it is raining. James is driving a car.
It is not raining can be inferred via the modus tollens rule. If it snows, then it is raining can be inferred via the biconditional elimination rule. If it rains, then it is snowing can be inferred via the biconditional elimination rule.