shithub: riscv

ref: cb091e75393b176ccb02c68f0ecfcfbb8bc49376
dir: /sys/games/lib/sudoku/boards/hard-2005-04-22.su/

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9..7....4
.4..3....
..2..6.3.
..7.....6
6.92.74.3
8.....7..
.5.3..9..
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2....5..1
963718524
145932678
782546139
537184296
619257483
824693715
458321967
371469852
296875341