Charlie is blue. Charlie is cold. Charlie is quiet. Dave is blue. Dave is quiet. Dave is red. Gary is cold. If someone is nice and not quiet then they are red. If someone is blue and cold then they are not young. If someone is rough then they are red. Cold people are rough. If Charlie is young and Charlie is not quiet then Charlie is cold. If Gary is red and Gary is not rough then Gary is blue. If someone is not blue then they are young. If someone is not cold and not young then they are not nice.
Gary is not blue.