Bob is furry. Bob is smart. Bob is white. Bob is young. Erin is kind. Fiona is furry. Fiona is quiet. Fiona is rough. Fiona is young. Gary is quiet. Gary is smart. Gary is young. Furry things are white. If something is rough and smart then it is furry. All kind, rough things are smart. If Fiona is kind then Fiona is furry. If Erin is quiet and Erin is white then Erin is kind. If Erin is white and Erin is kind then Erin is young. Kind things are rough.
Erin is not white.