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