Dave is quiet. Dave is red. Dave is rough. Dave is white. Dave is young. Erin is not quiet. Erin is red. Erin is rough. Fiona is big. Fiona is blue. Fiona is red. Fiona is rough. Fiona is white. Fiona is young. Gary is quiet. Gary is not rough. If Dave is blue then Dave is not big. If Erin is quiet then Erin is not red. If someone is young and not white then they are big. All young people are red. Rough, blue people are quiet. If Fiona is not rough and Fiona is not big then Fiona is red. If someone is blue and not big then they are not rough. If someone is young and not big then they are quiet.
Erin is white.