insertion a la your first example.
List order is left intact, so your second example is the wrong way around, you should get {U, V, 1, 2, 3, W, X, Y, Z}.
The third example won't work. You must supply equal numbers of SetB data and Imap integers (unless you supply only 1 item, see before).
--
David Rutten
david@mcneel.com
Poprad, Slovakia…
Added by David Rutten at 4:10am on September 11, 2010