Charlie is round. Dave is furry. Dave is white. Fiona is furry. Fiona is rough. Fiona is smart. Harry is smart. If someone is white and smart then they are red. If someone is round then they are furry. All smart, red people are rough. If someone is round and furry then they are big. Round, big people are white. If someone is round and white then they are smart.
Harry is not round.