Sudoku #h51

Sudoku game, level: Hard #51. This Sudoku have 26 given numbers (clues)..
Structure: 2 (1 pcs.), 4 (1 pcs.), 9 (2 pcs.), 3 (3 pcs.), 6 (3 pcs.), 8 (3 pcs.), 5 (4 pcs.), 7 (4 pcs.), 1 (5 pcs.), ∑26.


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