Bob is rough. Bob is young. Dave is furry. Dave is smart. Fiona is not blue. Fiona is smart. Harry is red. All young people are blue. If Bob is smart then Bob is rough. If someone is rough then they are red. Furry people are not young. If someone is red and not blue then they are not young. If someone is round and not blue then they are young. If someone is not furry and not young then they are rough. If someone is blue and not rough then they are red.
Harry is furry.