X            X      XX     XX     XX     X      X      X      X             XX     X      XX            XX     XX      X     XX     XX     XX     XX            XX     XX     XX     XX     XX     XX     XX     XX     XX     XX     XX     XX
XX     XX     XX     XX     XX     XX     XX     XX     XX     XX     XX     XX     XX     XX     XX     XX     XX
______X____________X______XX_____XX_____XX_____X______X______X______X_____________XX_____X______XX____________XX_____XX______X_____XX_____XX_____XX_____XX____________XX_____XX_____XX_____XX_____XX_____XX_____XX_____XX_____XX_____XX_____XX_____XXXX_____XX_____XX_____XX_____XX_____XX_____XX_____XX_____XX_____XX_____XX_____XX_____XX_____XX_____XX_____XX_____X