Bob is big. Bob is blue. Bob is furry. Bob is quiet. Bob is round. Bob is not smart. Dave is big. Dave is not furry. Dave is rough. Dave is round. Big, furry people are quiet. If Bob is furry and Bob is not round then Bob is rough. Big people are blue. All smart, round people are big. If someone is furry and not blue then they are quiet. If someone is furry and not quiet then they are rough.
Dave is not blue.