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