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For clarity add: Initial Rep @Mode Expression Value Final Rep ------------------------------------------------------------------------- <a/> Replace / <a'/> <a'/> <a/> InsertBefore / <a'/> fault <a/> InsertAfter / <a'/> fault InsertBefore / <a/> <a/> InsertAfter / <a/> <a/> <a/> InsertBefore /a/b <b/> <a><b/></a> <a/> InsertAfter /a/b <b/> <a><b/></a> For each "/" in the expression column replace it with "/ or /*" to make it clear that they're the same.
resolved as proposed