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 Patricia drives a car, then Karen is a nurse. Karen is a nurse if and only if Patricia is driving a car.
If Karen were a nurse, then Patricia is driving a car can be inferred via the biconditional elimination rule. If Patricia drives a car, then Karen is a nurse can be inferred via the biconditional elimination rule.