Naked Triple
Three cells hold only three candidates between them, so those three digits are used up between them.
How it works on this board
2, 4 and 5 must be used within the highlighted cells
8
4
7
6
3
1
2
2
6
5
9
4
7
8
1
3
5
8
2
4
7
6
9
7
3
3
7
6
3
6
5
8
9
9
2
7
1
6
8
9
3
6
7
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