What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: Richard is sleeping. If William were a carpenter, then Richard is not sleeping. Charles is an artist or David is driving a car. If Charles were an artist, then it is windy. If David drives a car, then it is windy.
William is not a carpenter can be inferred via the modus tollens rule. It is windy can be inferred via the disjunction elimination rule.