X      X      X      X      X      X      XX     XX                   X      X      X      X             X      X                           X      X             X      X      X      X      X      X      X      X      X      XX     XX     XX
XX     XX     XX     XX     XX     XX     XX     XX     XX     XX     XX     XX     XX     XX     XX     XX     XX
_____X______X______X______X______X______X______XX_____XX___________________X______X______X______X_____________X______X___________________________X______X_____________X______X______X______X______X______X______X______X______X______XX_____XX_____XXXX_____XX_____XX_____XX_____XX_____XX_____XX_____XX_____XX_____XX_____XX_____XX_____XX_____XX_____XX_____XX_____X