/usr/lib/help/list-ref is in scheme9 2013.11.26-1.
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1 2 3 4 5 6 | R4RS 6.3 (list-ref list integer) ==> obj
Returns the INTEGER'th element of list. (This is the same as the
car of (list-tail list INTEGER).)
(list-ref '(a b c d) 2) ==> c
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