How to select a common external contour from different rectangles

Hello!
Please tell me how to select a common external contour from different rectangles? And how to highlight the inner edges of the rectangles?

Something like this.
Rect.gh (11.8 KB)

You need AlphaShape

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This could be one way of using heteroptera plugin.



BoundaryRegion
BoundaryRegion_re.gh (20.2 KB)

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