Dave is huge. Dave is high. Charlie is thin. Charlie is little. Gary is smart. Alan is sad. Alan is dull. If someone is not big then they are sad. If someone is not poor then they are nice. If someone is smart then they are wealthy. If someone is wealthy and not rough then they are kind. If someone is sad and not big then they are bad. All bad people are short. If someone is thin and little then they are rough. If someone is rough and not wealthy then they are dull. If someone is dull then they are young. If someone is nice then they are clever. All clever people are quiet. All kind people are experienced. 
Alan is not quiet.