shithub: riscv

ref: 8a45afd47d2545b2d85aecf9ec5af90cba3905d3
dir: /sys/games/lib/sudoku/boards/medium-2005-02-24.su/

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..12..5.9
34.....82
....79...
75.9.....
.2.....9.
.....4.67
...83....
43.....71
9.2..63..
671283549
349615782
285479136
756928413
124367895
893154267
567831924
438592671
912746358