Sudoku #h78

Sudoku game, level: Hard #78. This Sudoku have 27 given numbers (clues)..
Structure: 5 (0 pcs.), 1 (2 pcs.), 2 (2 pcs.), 4 (2 pcs.), 3 (3 pcs.), 8 (3 pcs.), 9 (4 pcs.), 6 (5 pcs.), 7 (6 pcs.), ∑27.


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