Sudoku #h554

Sudoku game, level: Hard #554. This Sudoku have 28 given numbers (clues)..
Structure: 6 (1 pcs.), 4 (2 pcs.), 1 (3 pcs.), 2 (3 pcs.), 3 (3 pcs.), 8 (3 pcs.), 5 (4 pcs.), 7 (4 pcs.), 9 (5 pcs.), ∑28.


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