/usr/lib/help/length is in scheme9 2013.11.26-1.
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1 2 3 4 5 6 7 | R4RS 6.3 (length list) ==> integer
Returns the length of list.
(length '(a b c)) ==> 3
(length '(a (b) (c d e))) ==> 3
(length '()) ==> 0
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