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fixpoint data sudoku hard
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data/sudoku/hard

+-------+-------+-------+
| 4 . . | . 3 9 | . 2 . | 
| . 5 6 | . . . | . . . | 
| . . . | . . . | 6 . 4 | 
+-------+-------+-------+
| . . . | . . . | 9 . . | 
| 5 . . | 1 . . | 2 . . | 
| . 9 . | . 2 7 | . 3 . | 
+-------+-------+-------+
| . 3 7 | . . . | . . . | 
| . . . | . . . | 8 . 6 | 
| 9 . 8 | . 1 . | . . . | 
+-------+-------+-------+

This instance has a single solution.

..6....9....5.17..2..9..3...7..3..5..2..9..6..4..8..2...1..3..4..52.7....3....8..