shithub: riscv

ref: 985b2457cda207c2c65edeb647aedbb6e92dac46
dir: /sys/games/lib/sudoku/boards/medium-2005-04-21.su/

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...9..3..
3.9.....1
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8....642.
.3..4..7.
.743....9
6...81...
9.....2.8
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415967382
369428751
728153694
891576423
236849175
574312869
653281947
947635218
182794536