shithub: riscv

ref: 94e26e7576fabcaacd8fa8f75c4f87f9eb6e56f3
dir: /sys/games/lib/sudoku/boards/medium-2005-05-18.su/

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....4....
57.1.6..2
.2..9.78.
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6..3.4.28
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981247365
573186942
426593781
254631879
168729453
739458216
842965137
697314528
315872694