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