Bob is big. Bob is high. Charlie is small. Charlie is thin. Alan is wealthy. Gary is dull. Gary is poor. If someone is not huge then they are dull. If someone is not rough then they are quiet. If someone is wealthy then they are nice. If someone is nice and not sad then they are kind. If someone is dull and not huge then they are bad. If someone is small and thin then they are sad. If someone is sad and not nice then they are poor. All quiet people are smart. 
Gary is smart.