xref: /plan9-contrib/sys/games/lib/sudoku/boards/hard-2005-04-22.su (revision a8e650f8b6804428114023f948a3fb1a4d7b82d3) 
19..7....4
2.4..3....
3..2..6.3.
4..7.....6
56.92.74.3
68.....7..
7.5.3..9..
8....6..5.
92....5..1
10963718524
11145932678
12782546139
13537184296
14619257483
15824693715
16458321967
17371469852
18296875341
19