Anne is furry. Dave is cold. Dave is furry. Dave is nice. Dave is rough. Dave is white. Harry is cold. Harry is furry. Harry is green. Harry is rough. All green people are white. If Dave is furry and Dave is not nice then Dave is rough. If someone is furry then they are rough. All young, white people are not rough. If someone is young and not white then they are not nice. If someone is not rough and not nice then they are not white.
Dave is not green.