Sudoku #m523

Sudoku game, level: Medium #523. This Sudoku have 23 given numbers (clues)..
Structure: 1 (1 pcs.), 5 (2 pcs.), 7 (2 pcs.), 8 (2 pcs.), 9 (2 pcs.), 2 (3 pcs.), 3 (3 pcs.), 4 (4 pcs.), 6 (4 pcs.), ∑23.


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