XX            X      X      XX     X      XX            XX     XX     XX     X      XX     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             X
_____XX____________X______X______XX_____X______XX____________XX_____XX_____XX_____X______XX_____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_____________X