wW | wW ww | W W | WW Ww w | wW ww | ww wW | ww wW | wW wW | wW wW | ww ww ------+--------+--------+--------+-------- wW w | wW | ww wW | wW ww | ww wW | wW ww | ww | W w | w w ------+--------+--------+--------+--------