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