How to remove mirrored pairs from the list?

[serg.spb]

Hello everybody. I was looking for the intersection of solids many walls in the drawing. As a result, I got a list of this kind. Containing a pair of Solids in direct and mirror image. Please tell me how can I exclude from the list of unnecessary couples to list remained after the pairs? Can I do this dynamo nodes without python scripts? Thank you

[Yna_Db]

You could try to insert a List.Sort node in between…

[viktor_kuzev]

You could use List.FirstItem @L2 or flatten the list of pairs and then connect it to List.UniqueItems.

[serg.spb]

Thak you very much. It works.

[serg.spb]

I used your way too. Thank you very much