shithub: riscv

ref: 834f6703498f95ca6534463db6ecb32acb5487fa
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
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523476198
734192865
265847319
198635247