Select list items in dynamo

Hi, everyone.

I have a little problem about select list items in dynamo.

First, get 26 surfaces from revit element. and i want to select first and last item.
There’s no problem up to here…

And then i also want to select surfaces in the middle of 26 surfaces.
but i don’t know select which one and how many.
which mean is i want to make a adjustable…

Does anyone have an idea?

Thank you.

What is the logic of the surfaces you selected? Like how did you manually decide that the first, fourth, sixth and eleventh items were what you wanted?

Once you know that use some nodes to build such a logic routine. Sometimes this is easier said than done.

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