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Naked Single
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Only one digit fits the ringed cell.
Place it.
6
4
2
1
3
7
9
2
6
5
1
3
4
7
9
5
2
7
6
5
2
6
9
6
9
3
8
1
4
7
2
1
3
5
6
9
8
4
8
1
3
5
6
1
2
3
6
1
2
3
9
1
2
3
4
8
7
1
2
3
4
9
8
2
3
6
7
5
1
2
3
4
5
6
7
8
9
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