X     XX     XX     XX     XX     X      X      X             X      XX     XX            XX     XX            XX     XX    XXXX    XX     XX     XX                 X XX     XXX    XX     XX     XX     XX     XX     XX      X     XXX    XX     X
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X_____XX_____XX_____XX_____XX_____X______X______X_____________X______XX_____XX____________XX_____XX____________XX_____XX____XXXX____XX_____XX_____XX_________________X_XX_____XXX____XX_____XX_____XX_____XX_____XX_____XX______X_____XXX____XX_____X________XX_____XX_____XX