Sudoku #h597

Sudoku game, level: Hard #597. This Sudoku have 26 given numbers (clues)..
Structure: 1 (2 pcs.), 5 (2 pcs.), 8 (2 pcs.), 3 (3 pcs.), 4 (3 pcs.), 6 (3 pcs.), 7 (3 pcs.), 2 (4 pcs.), 9 (4 pcs.), ∑26.


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