shithub: riscv

ref: 78c7cd0c010c1c90dbc3358c2710bddaed379ce9
dir: /sys/games/lib/sudoku/boards/medium-2005-01-26.su/

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78.9.2..3
...4.....
135.8....
.2..1..78
.........
67..9..2.
....6.592
.....3...
2..5.9.61
784952613
962431857
135786249
423615978
859247136
671398425
317864592
596123784
248579361