Harry is huge. Harry is strong. Dave is thin. Dave is small. Alan is smart. Charlie is dull. Charlie is rough. If someone is not high then they are dull. If someone is not sad then they are quiet. If someone is smart then they are nice. If someone is nice and not poor then they are clever. If someone is dull and not high then they are bad. All bad people are short. If someone is thin and small then they are poor. If someone is poor and not nice then they are rough. If someone is rough then they are young. If someone is quiet then they are kind. All kind people are wealthy. All clever people are old. 
Dave is young.