shithub: riscv

ref: 985b2457cda207c2c65edeb647aedbb6e92dac46
dir: /sys/games/lib/sudoku/boards/medium-2005-03-22.su/

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.7...54..
1.5.3....
.6.81..73
7......6.
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.1......2
98..72.3.
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269814573
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521643789