shithub: riscv

ref: ff2ebe6cfdacd890a74a6d2f9b0acd062d2633b7
dir: /sys/games/lib/sudoku/boards/medium-2005-04-20.su/

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....5.21.
.2.7..6.9
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..1...54.
58..2..96
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346958217
128743659
957216384
271689543
584321796
693475128
862197435
715834962
439562871