Centroid of members in sublists

I have in a sublist x elements i want to “join” these solids and get the centroid of them
In this example i want the centroid of the elements in the red circle

Add another Solid.ByUnion node, or a List.Flatten node before the Solid.ByUnion set to @L3 for the input, meaning you’ll have a list of solids for each sublist, instead of a list of sublists of solids for each sublist.

thank you again

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