Sudoku #x669

Sudoku game, level: Expert #669. This Sudoku have 29 given numbers (clues)..
Structure: 2 (1 pcs.), 3 (2 pcs.), 5 (2 pcs.), 6 (3 pcs.), 7 (3 pcs.), 8 (3 pcs.), 9 (4 pcs.), 1 (5 pcs.), 4 (6 pcs.), ∑29.


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