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If two cells in a group (row, column or 3x3 box)
contain an identical pair of candidates and no other cells in that group contain those 2 candidates,
then other candidates in those two cells can be excluded safely.
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In the example above, the candidates 2 & 5 are only located
in two highlighted cells of the row, and therefore form a pair.
All candidates except 2 & 5 can safely be excluded from these two
cells as one cell must be the 2 while the other must be the 5.
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