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 Michael is driving a car. If Michael drives a car, then Barbara is a carpenter. David is not a mechanic or it is cloudy. If David were sad, then Barbara is a carpenter. David is a mechanic or David is a police officer. David is not a police officer or David is sad.
If it is cloudy, then Barbara is a carpenter. David is a police officer or it is cloudy.