X     XX     XX     XX     XX     XX     XX     X      XX     XX     XX     XX     XX     XX            XX     X      XX     XX     XX     XX     XX     XX     X      XX     XX     XX
XX     XX     XX     XX     XX     XX     XX     XX     XX     XX     XX     XX     XX     XX     X
X_____XX_____XX_____XX_____XX_____XX_____XX_____X______XX_____XX_____XX_____XX_____XX_____XX____________XX_____X______XX_____XX_____XX_____XX_____XX_____XX_____X______XX_____XX_____XX_______________XX_____XX_____XX_____XX_____XX_____XX_____XX_____XX_____XX_____XX_____XX_____XX_____XX_____XX_____