Sudoku #h313

Sudoku game, level: Hard #313. This Sudoku have 28 given numbers (clues)..
Structure: 2 (1 pcs.), 4 (2 pcs.), 5 (2 pcs.), 3 (3 pcs.), 6 (3 pcs.), 9 (4 pcs.), 8 (4 pcs.), 7 (4 pcs.), 1 (5 pcs.), ∑28.


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8
6
7
1
9
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9
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7
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8
6
3
3
2
7
1
8
9
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4
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7
6
8
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