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We are looking for three rows (or columns) that contain up to
three of a particular number in the same relative position.
Although Swordfish are an extension of X-Wing.
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In the example above, each of the three rows (two, six & eight) have candidate 5 in no more than three cells
which share the same three columns (five, seven & nine).
A Swordfish pattern is established. Other candidate 5's in these
three columns (highlighted yellow) can be excluded safely.
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