What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? It is cloudy if and only if it is raining. It is raining if and only if it is cloudy.
If it is cloudy, then it is raining. If it rains, then it is cloudy. If it rains, then it is cloudy. If it is cloudy, then it is raining.