Dave is big. Dave is nice. Dave is quiet. Dave is red. Dave is not smart. Dave is white. Dave is young. Fiona is not big. Fiona is not nice. Fiona is not quiet. Fiona is red. Fiona is not smart. Fiona is white. Fiona is young. If someone is nice and not big then they are white. If someone is not nice and not big then they are red. Nice people are red. If Fiona is not smart then Fiona is red. All smart, quiet people are not white. If someone is smart and not white then they are not young.
Fiona is young.