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