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The same principle that applies to Hidden Pairs
applies to Hidden Triples and Hidden Quads.
A Hidden Triple occurs when three candidates are only in
three cells in a group (row, column or 3x3 box).
Wenn no other cells in that group contain those 3 candidates,
other candidates in those three cells can be excluded safely.
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In the example above, the candidates 2, 4 & 5 are only located
in the tree highlighted cells of the 3x3 box, and therefore form a Triple.
All other candidates (except 2, 4 & 5) can safely be
excluded from those three cells.
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