shithub: riscv

ref: 78c7cd0c010c1c90dbc3358c2710bddaed379ce9
dir: /sys/games/lib/sudoku/boards/hard-2005-04-23.su/

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.3..47.8.
.261..7..
4.......6
3..42....
.4.7.3.5.
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5.......8
..8..437.
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931647285
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649713852
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173862594