Dave is strong. Dave is big. Gary is thin. Gary is little. Erin is quiet. Bob is sad. Bob is dull. If someone is not huge then they are sad. If someone is not rough then they are nice. If someone is quiet then they are kind. If someone is kind and not poor then they are wealthy. If someone is sad and not huge then they are bad. If someone is thin and little then they are poor. If someone is poor and not kind then they are dull. All nice people are smart. 
Gary is not dull.