Subtract lists from each other (surface)

Filtered some triangles out of a list with a series. Now I want to subtract this list (every 6th triangle) from the original one, so that I can access the filtered triangles and the remaining ones separately. Any idea how? (14.7 KB)

What you need is Split Tree or Cull Index (16.1 KB)

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Thank you so much for your help, you are awesome!