Sudoku #h494

Sudoku game, level: Hard #494. This Sudoku have 28 given numbers (clues)..
Structure: 3 (1 pcs.), 6 (1 pcs.), 2 (2 pcs.), 9 (2 pcs.), 1 (4 pcs.), 4 (4 pcs.), 7 (4 pcs.), 8 (4 pcs.), 5 (6 pcs.), ∑28.


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5
9
2
1
4
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7
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8
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7
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5
8
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7
4
5
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