shithub: riscv

ref: 1f95e98dddc420321a8942d9f3195d966c7cc6c0
dir: /sys/games/lib/sudoku/boards/medium-2005-02-15.su/

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.6.531..7
.7....8.5
.....74..
2...63...
.5.....2.
...42...6
..21.....
4.8....5.
5..849.3.
864531297
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925687413
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657918324
389425176
732156948
498372651
516849732