What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If it is cloudy, then it is raining. If Thomas takes a plane, then it is raining. If it is overcast, then it is not raining. Thomas is taking a plane or it is snowing. If it snows, then it is cloudy.
If it snows, then it is raining.