Sudoku #x740

Sudoku game, level: Expert #740. This Sudoku have 30 given numbers (clues)..
Structure: 4 (2 pcs.), 8 (2 pcs.), 9 (3 pcs.), 7 (3 pcs.), 5 (3 pcs.), 2 (3 pcs.), 3 (4 pcs.), 1 (5 pcs.), 6 (5 pcs.), ∑30.


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