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