group by proximity

Hi all. .  I'm trying to make this branching algorithm on a building that works by projecting out planes from an existing building facade. Each plane should be the next order of branching. I'm trying to group a list of points by proximity so that every time two points create one branching point on the next plane . .Seems like this should be simple I can’t make it work in grasshopper

It boils down to this, all I want to do is group a list of points on a plane by pairs based on their proximity to each other. The two components that I found : proximity 2D and octree are very limited. The proximity component sometimes reselects the same point for two groups and has no visited/non-visited Boolean. Octree does that but sometimes leaves points on their own without a pair . I'm trying to combine the two but its messy and not very associative maybe a simple VB script component should do it    . Any ideas ?

Thanks !!