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: It is windy or it is raining. If it rains, then John is a cashier. Barbara is driving a car if and only if it is windy. If Barbara drives a car, then John is a cashier.
If Barbara drives a car, then it is windy can be inferred via the biconditional elimination rule. If it is windy, then Barbara is driving a car can be inferred via the biconditional elimination rule.