Sudoku #x158

Sudoku game, level: Expert #158. This Sudoku have 21 given numbers (clues)..
Structure: 9 (1 pcs.), 8 (2 pcs.), 6 (2 pcs.), 3 (2 pcs.), 2 (2 pcs.), 7 (2 pcs.), 5 (3 pcs.), 1 (3 pcs.), 4 (4 pcs.), ∑21.


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9
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8
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