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- Palisade
- <p>
- Draw lines along the grid edges, in such a way that the grid is
- divided into connected regions, all of the size shown in the status
- line. Also, each square containing a number should have that many of
- its edges drawn in.
- <p>
- Click on a grid edge to mark it as a division between regions (black),
- and again to return to marking it as undecided (yellow). Right-click
- on a grid edge to mark it as definitely not part of the loop (faint
- grey), and again to mark it as undecided again.
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