/usr/lib/s9fes/help/set-difference is in scheme9 2010.11.13-2.
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 (set-difference list ...) ==> list
Compute the difference of a number of sets.
(set-difference '(a b c d e f) '(b d) '(a f)) ==> (c e)
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