Sudoku #x691

Sudoku game, level: Expert #691. This Sudoku have 18 given numbers (clues)..
Structure: 8 (1 pcs.), 3 (1 pcs.), 9 (1 pcs.), 6 (2 pcs.), 5 (2 pcs.), 1 (2 pcs.), 2 (3 pcs.), 7 (3 pcs.), 4 (3 pcs.), ∑18.


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