Joining list

Good morning all.
I’m trying to “join” those 2 lists of lists to create a list of 4 points in the actual order.
top list 2 points first, then bottom list 2 points.
Tried with LIst.Combine but with no luck

You should find useful information in this thread:

i actually turned to Colin McCrone’s awesome Ampersand package with the &PointGrid.ToQuadSets

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