Sudoku #x821

Sudoku game, level: Expert #821. This Sudoku have 19 given numbers (clues)..
Structure: 9 (0 pcs.), 8 (1 pcs.), 7 (2 pcs.), 3 (2 pcs.), 6 (2 pcs.), 5 (3 pcs.), 2 (3 pcs.), 4 (3 pcs.), 1 (3 pcs.), ∑19.


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