Sudoku #h527

Sudoku game, level: Hard #527. This Sudoku have 25 given numbers (clues)..
Structure: 1 (1 pcs.), 2 (1 pcs.), 7 (3 pcs.), 9 (3 pcs.), 5 (3 pcs.), 3 (3 pcs.), 4 (3 pcs.), 6 (4 pcs.), 8 (4 pcs.), ∑25.


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9
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