shithub: riscv

ref: c5393d612fd2a0e4ff3f9557dcb6adb2ad27391f
dir: /sys/games/lib/sudoku/boards/medium-2005-04-29.su/

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5.1....7.
..94....2
.6..1.9.8
...1..784
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254..6...
4.5.7..3.
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879463512
362517948
936125784
718349256
254786391
425671839
183952467
697834125