Sudoku #m220

Sudoku game, level: Medium #220. This Sudoku have 23 given numbers (clues)..
Structure: 1 (2 pcs.), 8 (2 pcs.), 3 (2 pcs.), 9 (2 pcs.), 7 (3 pcs.), 5 (3 pcs.), 2 (3 pcs.), 4 (3 pcs.), 6 (3 pcs.), ∑23.


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