shithub: riscv

ref: 31c5c1ac9a99ac12c395882e25aec3d7d98de016
dir: /sys/games/lib/sudoku/boards/hard-2005-05-15.su/

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7...1...6
..25.4...
..4.9....
2....58.3
.5.2.6.7.
1.79....2
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4...2...8
735812496
982564731
614793285
269175843
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876351924
493627518