Subtract point list from another list at certain index

Revit
1

Hey all,

This is my first post on the forum. I have been looking for the answer for hours but alas.
Here is the thing.
I have two lists of points and i want to subtract the second list from the first list but according to the right index.
so from the first list @L3 = index 0 I want to subtract the value of the second list at index 0@L2, then from the first list @L3, index 1 i want to subtract the value of the second list at index 1@L2. Then those matching items should be deleted in list 1

image
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Please help or tell me if i ain’t clear.

2

So I want to arrive at a list with 40 elements with the right point subtracted

3

So, something like this?

lists
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lists.dyn (19.8 KB)

(I just threw in some random numbers though it should work with points just as well, and the distribution probably isn’t quite right but I couldn’t be bothered to sort that out and I’m sure you can figure it out from there :innocent:)