Charlie is quiet. Charlie is rough. Charlie is round. Dave is blue. Dave is not cold. Gary is cold. Gary is rough. Gary is round. Gary is white. Gary is young. All blue, round people are not cold. All rough, young people are white. If someone is quiet then they are blue. If someone is quiet then they are rough. If Dave is young and Dave is white then Dave is not rough. All blue people are not young. If Gary is not rough then Gary is quiet. If someone is round and not white then they are blue.
Dave is not rough.