Sudoku #h289

Sudoku game, level: Hard #289. This Sudoku have 23 given numbers (clues)..
Structure: 2 (1 pcs.), 8 (2 pcs.), 9 (2 pcs.), 7 (3 pcs.), 6 (3 pcs.), 5 (3 pcs.), 3 (3 pcs.), 4 (3 pcs.), 1 (3 pcs.), ∑23.


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