Sudoku #m603

Sudoku game, level: Medium #603. This Sudoku have 23 given numbers (clues)..
Structure: 4 (1 pcs.), 1 (2 pcs.), 5 (2 pcs.), 7 (2 pcs.), 8 (2 pcs.), 2 (3 pcs.), 3 (3 pcs.), 6 (4 pcs.), 9 (4 pcs.), ∑23.


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