Sudoku #h171

Sudoku game, level: Hard #171. This Sudoku have 25 given numbers (clues)..
Structure: 7 (1 pcs.), 3 (2 pcs.), 5 (2 pcs.), 8 (3 pcs.), 2 (3 pcs.), 6 (3 pcs.), 4 (3 pcs.), 9 (4 pcs.), 1 (4 pcs.), ∑25.


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