shithub: riscv

ref: de19776b2f793de7fdf1111d84d96eb29f9a22fd
dir: /sys/games/lib/sudoku/boards/hard-2005-04-17.su/

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3..9...16
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24...1..8
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612397584
584126973
793548162
357982416
861435297
249761358
435679821
126853749
978214635