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