Bob is big. Dave is furry. Dave is nice. Dave is white. Dave is young. Fiona is quiet. Fiona is young. Gary is furry. Gary is nice. Gary is quiet. Gary is round. Round people are nice. If Gary is young then Gary is quiet. Furry people are young. If someone is big then they are furry. Young people are round. If someone is nice then they are quiet. If Bob is not quiet then Bob is not nice.
Fiona is not nice.