Bob is cold. Bob is nice. Bob is white. Bob is young. Dave is cold. Dave is nice. Dave is round. Dave is white. Fiona is cold. Fiona is round. Fiona is smart. Fiona is white. Fiona is young. Harry is cold. Harry is smart. Harry is young. All blue people are round. Smart people are nice. Young, round people are white. If someone is young then they are white. If Fiona is round then Fiona is cold. If someone is nice and young then they are blue.
Dave is not blue.