shithub: riscv

ref: c2a290b8fe17f06370bc748552f2af1d58f50a71
dir: /sys/games/lib/sudoku/boards/hard-2005-05-19.su/

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17.3.....
...1.48..
.34.29...
3........
..72485..
........6
...87.92.
..25.1...
.....2.85
175386492
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359617248
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482591367
793462185