I do not know if this will help, but:
example: ":"0(?.10 # 5){(+?.)5#1e7
This is ten lines of some random "textual" data to be dedupped.
~.example
This should give you those lines without any duplicates.
Actually, all of your set operations should "just work", except
of course they are working on character data (so for example,
if you had numbers of different lengths, they would be sorted
as text rather than as numbers).
--
Raul
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