shithub: riscv

ref: 0fc2adb43dc8be67b6eca49e3e28339367a01246
dir: /sys/games/lib/sudoku/boards/medium-2005-03-24.su/

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..3729.6.
.2.8..73.
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7.69..2..
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921846735
687531924
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435682179
716954283
852493617
174265398
369178452