/usr/lib/help/substitute is in scheme9 2013.11.26-1.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 | S9 LIB (substitute pair alist) ==> pair
Substitute objects in a given PAIR. The association list
ALIST contains the objects to be substituted as keys and
the corresponding substitutes as values.
(substitute '(* (+ 5 7) 9) '(((+ 5 7) . 12))) ==> (* 12 9)
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