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Sometimes a candidate within a box is restricted to one row or column.
Since one of these cells must contain that specific candidate,
the candidate can safely be excluded from the remaining cells
in that row or column outside of the box. In the example above,
the middle box only has candidate 2's in its middle row.
Since, one of those cells must be a 2, no cells in that row outside that box can be a 2.
Therefore 2 can be excluded as a candidate from the highlighted (yellow) cells.
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Sometimes a candidate within a row or column is restricted to one box.
Since one of these cells must contain that specific candidate,
the candidate can safely be excluded from the remaining cells in the box.
In the example above, the left column has candidate 3's only in the upper box.
Therefore, since one of these cells must be a 3
(otherwise the column would be without a 3), 3's can safely be excluded
from all cells in this box except those in the left column.
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