Merge overlapping tweened shapes (pufferfish)


I wonder if there is a way to merge overlapping tween shapes into separate shapes based on the overlapping contours, like pictured on the first picture. The first tweened shapes are flat, but have later been moved up to have the desired overlap more visable.



I have managed to get one part of the shapes cropped to the right shape, however, the lower shape I try to do the same thing but it tends to not crop the curves the right way so they can be joined to a surface. How do I get the same cropped shape on the lower curves?

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