DDDDDDDDDDDDDD
dddddddddd
…………………
DDDDDDDDDDDD
.....................
DDDDDDDD00000000000
DDDDDDDDDDD
DDDDDDDDDDDDDDDDDD
DDDDDDDDDDDDD
00000000000000
00000000000000000000000
DDDDDDDDDDDDDDDDDDDD
BBBBBBBBBBBBBB
0000000000000000000000000
DDDDDDDDDDDDDDD
ddddddddd000000000
…………………
0000000000000000
DDDDDDDDDDDDDD
000000000000000000