Sudoku #h175

Sudoku game, level: Hard #175. This Sudoku have 28 given numbers (clues)..
Structure: 9 (1 pcs.), 8 (2 pcs.), 7 (3 pcs.), 5 (3 pcs.), 2 (3 pcs.), 3 (3 pcs.), 4 (4 pcs.), 6 (4 pcs.), 1 (5 pcs.), ∑28.


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7
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6
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1
5
8
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6
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9
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1
2
5
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4
7
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8
6
4
3
7
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