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