shithub: riscv

ref: a609c1a2f8d58d21727c13970725445ce4d2f6fa
dir: /sys/games/lib/sudoku/boards/hard-2005-04-22.su/

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9..7....4
.4..3....
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6.92.74.3
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2....5..1
963718524
145932678
782546139
537184296
619257483
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458321967
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