cc..ccc.ccc..cc
...............
ccccc.....ccccc
.......B.......
...ccc...ccc...
...............
....bb...bb....
...............
.......b.......
...............
...............
.......c.......
...............
.....cc.cc.....
...............
...b.b...b.b...
.......A.......
bbbbb.....bbbbb
...............
bb..bbb.bbb..bb