/usr/lib/help/flatten is in scheme9 2013.11.26-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | S9 LIB (flatten pair) ==> list
Convert tree to flat list.
(flatten '(a (b ((c) d . e)))) ==> (a b c d e)
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