/usr/lib/help/string-translate 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 8 9 10 11 12 13 | S9 LIB  (string-translate string1 string2 string3)  ==>  string
Translate STRING1 by replacing each instance of a character
that occurs in STRING2 by the character at the corresponding 
position in STRING3. STRING-TRANSLATE does not alter STRING1
but returns a fresh string.
(string-translate "a:b:c" ":" "-")  ==> "a-b-c"
(string-translate
  "hello, world!"
  "abcdefghijklmnopqrstuvwxyz"
  "nopqrstuvwxyzabcdefghijklm")     ==>  "uryyb, jbeyq!"
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