Erin is not cold. Erin is green. Fiona is blue. Fiona is cold. Fiona is furry. Fiona is not quiet. Gary is cold. Gary is green. Harry is blue. Harry is furry. Harry is green. Harry is young. If someone is cold then they are rough. If someone is rough and not cold then they are not young. If Erin is green and Erin is not cold then Erin is quiet. Blue people are young. All quiet, rough people are not green. If Gary is not quiet and Gary is not young then Gary is rough.
Gary is not young.