Find point/lines where ExplodePolysurfaces happend

I have exploded a open polysurface, removed the top and button surfaces, and like to find the points/lines where the explosion happend. In the image below a point I like to detect is where the blue and the yellow surface connects.
You are looking at a top view, but the are all surfaces.

s = rs.GetObject("Pick a surface to segment")
tmp = rs.ExplodePolysurfaces(s, True)

I suppose you could try to get the intersection between the two split parts with rs.IntersectBreps, that will give you the points/curves where they touch.