Sudoku #h750

Sudoku game, level: Hard #750. This Sudoku have 27 given numbers (clues)..
Structure: 3 (1 pcs.), 2 (2 pcs.), 1 (3 pcs.), 4 (3 pcs.), 6 (3 pcs.), 7 (3 pcs.), 5 (4 pcs.), 8 (4 pcs.), 9 (4 pcs.), ∑27.


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5
9
7
7
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9
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9
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9
7
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4
8
6
1
8
6
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