Erin is green. Erin is young. Fiona is young. Gary is green. Harry is not rough. Harry is not round. Harry is young. If someone is not young then they are rough. If someone is rough then they are white. Green people are round. Round, kind people are green. If someone is rough and white then they are not young. If Gary is rough and Gary is not round then Gary is green.
Gary is not white.