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Fill in areas on shape
Hi, I have a shape like this (black is filled shape, no other stroke/ fills applied):

and am trying to find a way to make it so that if I overlay it with another copy it doesn’t mash together like this:

I’ve been bashing my head against this for a while and can’t find a simple way to do it. Basically I want to set the outmost borders as a masking area, but the outer path goes so far into the shape that I can’t just use that. Any guidance appreciated.