Careful, I think there's some missing indentation in these examples, and since 
we've discussed several alternatives it can get confusing.  Let's talk about 
"group" as it's currently defined. In that case:

group a b
. c d
(a b (c d))

But the other example given is actually two separate lists, since they are at 
the same indentation level:
group a b
c d
(a b)
(c d)

--- David A. Wheeler

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