Delete objects of a certain area

Hey there I am totally new at Grasshopper, my question is how to just delete the inner Objects of a randomly subdivisioned Surface that is generated with Grasshopper (like in the script attached. The pictures show once the subdivisioned surface and then the surface I want to get with the inner parts deleted.
Can anybody help?
Many Thanks! (6.7 KB)
Surface_DeletedInnerP Subdiv_Surface

Here some ways: (72.8 KB)


Couldn’t check it before today. It is exactly what I needed! Thank you for the quick answer :wink: