Sudoku #x863

Sudoku game, level: Expert #863. This Sudoku have 28 given numbers (clues)..
Structure: 6 (1 pcs.), 3 (2 pcs.), 4 (2 pcs.), 2 (3 pcs.), 9 (3 pcs.), 5 (4 pcs.), 7 (4 pcs.), 8 (4 pcs.), 1 (5 pcs.), ∑28.


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