% kuromasu 220 by Otto Janko, http://www.janko.at/Raetsel/Kuromasu/220.a.htm
kuromasu
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...c..........8....f......68.9.78...
4.....j.......4....9...6.....6..3...
..........8.......d..j.....c...4....
.....f.i.f..e....7.....a........g9..
.....5.....b...a.........6.........c
.ed.....a.7............b.......b....
8............j...........4..c.......
9...................a...........d...
.7.....99....j..c....b...66.....e.3c
...8.........j.............c...b....
....6...5.............h.........j...
b8.7.....ei...e....6..f....a4.....6.
...8...........j...................5
.......8..j...........c............6
....9.......a............4.9.....87.
5.........f.........k...o.....l.....
..68........a.....b....a..4.7.8.....
....8...b.....b..3.......b..........
...5..3.....a...2....9.......9.....9
...74.6.79......8....d..........5...
