19 4
..#ac#..###........
bb....dd#..dcd#.#C.
...c....a.d#d..ad..
.#....#...b#.#b....
.c###....#ba.#...c.
.##b..dd##d.#..#dc#
...#.......####d#.#
#..##..#.#...d...d.
#.b#bcb#.A.ac....#.
#.d..##..b##..a..#d
.#d.d..d#.b.c#....#
....c.#.###...#.c##
......#.cdc#.#a..a#
b.....Dd...........
.d#......#####.....
.#d.#bb#..#...b.#.b
.#a....#.#.#...##.a
..#..c#..#.#d...dBd
.a.#b..cba.#.db...b
