Removing all of List 2 in List 1 -- Revit Elements

[evargas7QQQV]

I have a list of rooms. I have another list of rooms. I want the first list of rooms not to have the rooms in list two.

I tried List.FilterByBoolMask, but this doesn’t except Revit Elements. I tried creating a Python Node to remove the elements, but havign trouble with Revit Elements.

[evargas7QQQV]

[Daan]

Hi @evargas7QQQV ,

Thought you might find this page nice to understand and read a bit more into these kinds of operations:

Intersection (set theory)

Under “See Also” there are also the other ones, like Intersection, Symmetric Difference and Union.