shithub: riscv

ref: ce1edc34368d192db7d3421673ca98c19cc792b2
dir: /sys/games/lib/sudoku/boards/medium-2005-02-25.su/

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3.....9..
67.4....1
4...98...
5....7..6
.3.6.1.7.
2..9....5
...21...9
7....6.32
..3.....8
382165947
679432581
451798623
514327896
938651274
267984315
846213759
795846132
123579468