Sudoku #m561

Sudoku game, level: Medium #561. This Sudoku have 23 given numbers (clues)..
Structure: 7 (1 pcs.), 2 (2 pcs.), 4 (2 pcs.), 6 (2 pcs.), 1 (3 pcs.), 3 (3 pcs.), 5 (3 pcs.), 8 (3 pcs.), 9 (4 pcs.), ∑23.


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