What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Barbara is drinking water if and only if it is cloudy. If Jessica listens to a song, then it is cloudy. If Robert were a soldier, then Jessica is listening to a song. If it is cloudy, then Robert is a soldier. Barbara is not drinking water.
If Jessica listens to a song, then Robert is a soldier. If Robert were a soldier, then it is cloudy. If it is cloudy, then Jessica is listening to a song. If Barbara drinks water, then it is cloudy. If it is cloudy, then Barbara is drinking water. It is not cloudy.