O.........O.....OOOOO....OOOO..........OOOOO.......OOOOO....OOOOO
O.........O.....O..............O.........O.......O.........O......O..............O...........
OOOOO......OOOO........OOOOO........O.........O.......OOOO.......OOOOO
O.........O.....O...............O..........O......O.........O......O..........................O
O.........O.....OOOOO. ...O............O.....OOOOO.......OOOOO........OOOOO