shithub: riscv

ref: 5bc9b0c3cac34864d479c099283793ec4ae5565e
dir: /sys/games/lib/sudoku/boards/easy-2005-03-08.su/

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.425....6
9.17...5.
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73.1...6.
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342519786
981763452
657284931
416928573
879351624
523476198
734192865
265847319
198635247