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