Sudoku #m51

Sudoku game, level: Medium #51. This Sudoku have 23 given numbers (clues)..
Structure: 9 (1 pcs.), 5 (1 pcs.), 2 (2 pcs.), 4 (2 pcs.), 1 (3 pcs.), 6 (3 pcs.), 7 (3 pcs.), 3 (4 pcs.), 8 (4 pcs.), ∑23.


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