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Sudoku
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1
5
9
4
7
2
7
8
5
1
7
8
1
9
6
2
6
5
4
9
2
3
9
3
9
8
7
1
8
3
4
8
9
6
3
2
1
2
3
4
5
6
7
8
9
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Click a cell, then a number. Blue = your entry, white = given.