WW | Ww Ww w | w W | WW WW | WW Ww | Ww | Ww Ww w | w w ------+--------+--------+--------+-------- WW W | WW WW | WW WW | Ww Ww ------+--------+--------+--------+-------- Ww W | WW WW | WW WW | Ww WW | Ww WW | WW WW |