/usr/lib/help/depth 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 (depth list) ==> integer
Compute the depth of a list.
(depth '(a (b (c d (e))))) ==> 4
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