It seems I won't be able to do this sort of bit and have it all fill in. It happens to be crucial to the type of illustration I will do since there will be a gazillion things like tiny leaves of grass, foliage etc. These overlap parts become transparent sections, by the way. The corners of the sections are undefinable by points, which makes a beginning of a solution rather difficult. I do not know where to start. But whatever it is, it has to be an easy fix, since I will have hundreds of instances in just one illustration. I could do shapes on shapes and flatten of course, but if anyone has ideas for the above with just one shape that has overlapping elements, please pass it on.