Sudoku #x836

Sudoku game, level: Expert #836. This Sudoku have 28 given numbers (clues)..
Structure: 4 (2 pcs.), 3 (2 pcs.), 9 (2 pcs.), 8 (3 pcs.), 7 (3 pcs.), 5 (4 pcs.), 2 (4 pcs.), 1 (4 pcs.), 6 (4 pcs.), ∑28.


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6
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9
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2
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