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 raining if and only if Barbara is a police officer. It is windy or it is raining. It is windy if and only if Barbara is a police officer.
If it rains, then Barbara is a police officer can be inferred via the biconditional elimination rule. If it is windy, then Barbara is a police officer can be inferred via the biconditional elimination rule. If Barbara were a police officer, then it is raining can be inferred via the biconditional elimination rule. If Barbara were a police officer, then it is windy can be inferred via the biconditional elimination rule.