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