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