How do I identify vertices along a (mesh) crease?

@RIL wrote:

So I manipulated a mesh by moving some vertices around, but in doing so I accidently move also vertices that belongs to “creases”, or would you call it edges?

Anyway, how do I identify such edges/creases using RhinoCommon/GrassHopper) that must not be moved in order to preserve the geometry (term: topology?)

Fig.1. The dent along the box edge - no good, no good.

bild.png1041x562 77.5 KB

// Rolf

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