Sudoku #h571

Sudoku game, level: Hard #571. This Sudoku have 24 given numbers (clues)..
Structure: 3 (1 pcs.), 4 (2 pcs.), 8 (2 pcs.), 2 (3 pcs.), 5 (3 pcs.), 6 (3 pcs.), 7 (3 pcs.), 9 (3 pcs.), 1 (4 pcs.), ∑24.


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