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