how to get "group difference" in the "foreach sop"

[MohamedSakr]

assume I got an object consists of 100 points

each 10 points are in a group so it is total of 10 groups

what I can access is each group, how to get the rest of points? as I don't know the group name ...

I want to use this with ray sop

so as the total primitives count is 100, the foreach is working on each 10 primitives , I want to cast rays from these 10 points on the rest of 90 points(converted to primitives) "as what I found is that ray distance doesn't work with same 2 inputs unless it is used for intersect furthest surface"

but what I need is the nearest surface which is always result in a distance of zero without different inputs "no shared points in the inputs to be clear"

sorry if the question is noob but I'm still learning

thanks in advance