Rules: Place all twelve pentomino shapes - once each - leaving the clue cells unused. Pentominoes may be rotated and reflected but may not touch each other, not even diagonally. Draw a vertical or horizontal line between each pair of pentominoes - starting and ending in the shapes, only passing through empty cells in between (including the clue cell), such that given number tells the length of the line connecting the shapes. Each line connects two shapes; each line must intersect one line, forming pairs of intersecting lines. Lines from one pair cannot intersect lines from another. Each shape corresponds to no more than one clue cell. Given x-marked cells, if any, cannot be used.
About: “Interference” was invented by Anurag Sahay.
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