Find corner surfaces in a divided surface

Im trying to select the corner surfaces of the divided surfaces, here in the image, the shaded surfaces has to be selected , how to sort them in list, cull or any discontinuity sorting where multiple vertices of individual surfaces meet,
like for example – 4 vertices of 4 individual surfaces meet up at one point and use that as a filter to find the rest ( the ones in the corner with < 4)

Hello, can you upload the gh file?

ceiling design square timber V2.gh (23.1 KB)
oops

Like this?
ceiling design square timber V2_Re.gh (28.1 KB)

Or I think you can do it using the following plugin.

Thank you!, Masaki, can you please help with, the tutorials which you recommend for list management and data trees for easier beginner-friendly introduction.

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Data Tree Masterclass with David Rutten

ESSENTIAL ALGORITHMS AND DATA STRUCTURES FOR GRASSHOPPER (by Rajaa Issa)

McNell Grasshopper Tips

Thanks a lott!, Masaki!!

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