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