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