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