When IS an appropriate time to use '()?  It's in the language, so I
assume there must be at least one good use case.

Recently, I was writing a function that yields a sequence of all the
subsequences of a given sequence, e.g.,
(subseqs '(1 2 3)) ->
(nil (1) (2) (3) (1 2) (1 3) (2 3) (1 2 3))

I had a very hard time deciding whether nil or '() belonged there
(eventually I decided on nil).

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