X     XX     XX     XX     XX     XX     XX     XX     XX     XX     XX     XX     XX     XX     XX     XX     XX     XX    XXXX    XX     XX     XX     XX          X XX
X_____XX_____XX_____XX_____XX_____XX_____XX_____XX_____XX_____XX_____XX_____XX_____XX_____XX_____XX_____XX_____XX_____XX____XXXX____XX_____XX_____XX_____XX__________X_XX