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