Bob is cold. Bob is rough. Charlie is cold. Charlie is rough. Charlie is smart. Dave is not green. Dave is quiet. Dave is rough. Fiona is cold. Fiona is green. Fiona is quiet. Fiona is smart. If someone is rough and smart then they are young. If someone is young and not smart then they are quiet. Rough people are cold. If someone is quiet then they are young. White people are young. If someone is cold and not smart then they are not green. If someone is white then they are not smart. If someone is green and not quiet then they are cold.
Dave is white.