Sudoku #x638

Sudoku game, level: Expert #638. This Sudoku have 21 given numbers (clues)..
Structure: 3 (1 pcs.), 9 (2 pcs.), 8 (2 pcs.), 5 (2 pcs.), 2 (2 pcs.), 4 (3 pcs.), 7 (3 pcs.), 6 (3 pcs.), 1 (3 pcs.), ∑21.


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9
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