...............|BBBBBBBBBBBBBBB|...............
BBBBBBBBBBBBBB.|BBBBBBBBBBBBBBB|...............
BBBBBBBBBBBBBB.|BBBBBBBBBBBBBBB|...........B...
...............|BBBBBBBBBBBBBBB|...............
|
..........|CCCCCCCCCC|..........
CCCCCCCCC.|CCCCCCCCCC|..........
CCCCCCCCC.|CCCCCCCCCC|.......C..
..........|CCCCCCCCCC|..........
|
..........|DDDDDDDDDD|..........
DDDDDDDDD.|DDDDDDDDDD|.......D..
DDDDDDDDD.|DDDDDDDDDD|..........
..........|DDDDDDDDDD|..........
|