Merge Two Lists and maintain structure

I’ve seen a lot on this topic but have not found just the right solution: I’m working with the old PointGrid.ToQuadSets in order to create a list of point for an 8-point Adaptive Component. I have the two lists, but can’t find a way to simply merge the lists together. How can this be done (preferable with nodes)?

Digging deeper: This solution worked for me

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