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The same principle that applies to
Naked Pairs
applies to Naked Triples and Naked Quads.
A Naked Triple occurs when three cells in a
group (row, column or 3x3 box) contain no candidates other than the same three candidates.
The cells which make up a Naked Triple don't have to
contain every candidate of the triple.
If these candidates are found in other cells in the group they can be excluded.
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In the example above, a Naked Triple is formed by the
left middle, middle bottom & right middle cells of a 3x3 box
since they only contain the candidates 2, 5 & 7.
Therefore the candidates 7 in the highlighted (yellow)
cells can be excluded safely.
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