Bob is big. Dave is big. Dave is furry. Dave is green. Dave is quiet. Harry is blue. Harry is quiet. Furry things are not blue. All rough, blue things are furry. All rough, big things are quiet. If Bob is blue and Bob is not big then Bob is furry. If something is rough and big then it is not young. Furry things are rough. Blue, furry things are quiet. If something is blue and not furry then it is quiet.
Dave is blue.