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Naked Pair
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1 and 8 form a naked pair in row 1.
Rule them out of the rest of the unit.
1
8
3
1
8
1
8
1
8
7
4
2
1
8
5
9
7
6
1
3
2
6
7
3
5
1
4
6
9
4
8
6
6
2
1
Rule out 1
Rule out 8
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