Sudoku #x616

Sudoku game, level: Expert #616. This Sudoku have 21 given numbers (clues)..
Structure: 4 (1 pcs.), 3 (1 pcs.), 9 (1 pcs.), 8 (3 pcs.), 7 (3 pcs.), 5 (3 pcs.), 2 (3 pcs.), 1 (3 pcs.), 6 (3 pcs.), ∑21.


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7
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