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SUBMIT YOUR IDEAMy solution. Completing challenge #27 helped a lot with this challenge.
At first, I thought that I had to turn these spatial objects into points than look at the convex hull, but then I realized it is Sunday afternoon and I am overthinking different aspects of this !!!!! So, splitting up the objects into regions and detailed regions, I found that detail regions show the hole. This led to a filter, which, in turn, finally an answer. This took me 20 minutes toooooo long!