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