shithub: riscv

ref: a15863b8ae23a26a2f825daf6107ab92e53c2669
dir: /sys/games/lib/sudoku/boards/medium-2005-04-29.su/

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5.1....7.
..94....2
.6..1.9.8
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254..6...
4.5.7..3.
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362517948
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718349256
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697834125