What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? It is snowing or it is not raining. If it snows, then it is raining. If it rains, then it is snowing.
If it rains, then it is snowing. It is snowing if and only if it is raining. It is raining if and only if it is snowing.