Sudoku #h330

Sudoku game, level: Hard #330. This Sudoku have 23 given numbers (clues)..
Structure: 8 (1 pcs.), 5 (1 pcs.), 9 (2 pcs.), 2 (3 pcs.), 7 (3 pcs.), 6 (3 pcs.), 4 (3 pcs.), 1 (3 pcs.), 3 (4 pcs.), ∑23.


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