Sudoku #h681

Sudoku game, level: Hard #681. This Sudoku have 26 given numbers (clues)..
Structure: 3 (1 pcs.), 4 (1 pcs.), 5 (2 pcs.), 6 (2 pcs.), 1 (4 pcs.), 2 (4 pcs.), 7 (4 pcs.), 8 (4 pcs.), 9 (4 pcs.), ∑26.


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5
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