X     X      XX     XX     XX                   XX     XX     XX     XX     XX             X            XX                  XXXX    XX     XX     XX            XX   X XX     XXX    XX     XX     XX     XX     XX     XX     XX     XXX    XX     XX
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X_____X______XX_____XX_____XX___________________XX_____XX_____XX_____XX_____XX_____________X____________XX__________________XXXX____XX_____XX_____XX____________XX___X_XX_____XXX____XX_____XX_____XX_____XX_____XX_____XX_____XX_____XXX____XX_____XX_XX_____XX_____XX_____XX_____XX_____XX_____XX_____XX_____XX_____XX_____XX_____XX_____XX_____XX_____XX_____XX_____