Sudoku #x679

Sudoku game, level: Expert #679. This Sudoku have 18 given numbers (clues)..
Structure: 9 (0 pcs.), 7 (2 pcs.), 8 (2 pcs.), 6 (2 pcs.), 5 (2 pcs.), 2 (2 pcs.), 4 (2 pcs.), 1 (3 pcs.), 3 (3 pcs.), ∑18.


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6
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7
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1
8
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