Sudoku #h137

Sudoku game, level: Hard #137. This Sudoku have 28 given numbers (clues)..
Structure: 8 (1 pcs.), 2 (2 pcs.), 4 (2 pcs.), 3 (3 pcs.), 6 (3 pcs.), 5 (4 pcs.), 7 (4 pcs.), 9 (4 pcs.), 1 (5 pcs.), ∑28.


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3
1
6
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1
9
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9
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6
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4
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3
7
9
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