/usr/lib/acl2-6.3/books/ is in acl2-books 6.3-5.
This file is owned by root:root, with mode 0o755.
There are a lot of files here (3018 total). We're only showing the immediate contents of /usr/lib/acl2-6.3/books.
/usr/lib/acl2-6.3/books
..
/usr/lib/acl2-6.3/books/add-ons/
/usr/lib/acl2-6.3/books/arithmetic/
/usr/lib/acl2-6.3/books/arithmetic-2/
/usr/lib/acl2-6.3/books/arithmetic-3/
/usr/lib/acl2-6.3/books/arithmetic-5/
/usr/lib/acl2-6.3/books/bdd/
/usr/lib/acl2-6.3/books/ccg/
/usr/lib/acl2-6.3/books/centaur/
/usr/lib/acl2-6.3/books/cgen/
/usr/lib/acl2-6.3/books/clause-processors/
/usr/lib/acl2-6.3/books/coi/
/usr/lib/acl2-6.3/books/concurrent-programs/
/usr/lib/acl2-6.3/books/cowles/
/usr/lib/acl2-6.3/books/cutil/
/usr/lib/acl2-6.3/books/data-structures/
/usr/lib/acl2-6.3/books/deduction/
/usr/lib/acl2-6.3/books/defexec/
/usr/lib/acl2-6.3/books/defsort/
/usr/lib/acl2-6.3/books/demos/
/usr/lib/acl2-6.3/books/finite-set-theory/
/usr/lib/acl2-6.3/books/fix-cert/
/usr/lib/acl2-6.3/books/hacking/
/usr/lib/acl2-6.3/books/hints/
/usr/lib/acl2-6.3/books/ihs/
/usr/lib/acl2-6.3/books/leftist-trees/
/usr/lib/acl2-6.3/books/make-event/
/usr/lib/acl2-6.3/books/memoize/
/usr/lib/acl2-6.3/books/meta/
/usr/lib/acl2-6.3/books/misc/
/usr/lib/acl2-6.3/books/models/
/usr/lib/acl2-6.3/books/ordinals/
/usr/lib/acl2-6.3/books/oslib/
/usr/lib/acl2-6.3/books/paco/
/usr/lib/acl2-6.3/books/parallel/
/usr/lib/acl2-6.3/books/parsers/
/usr/lib/acl2-6.3/books/powerlists/
/usr/lib/acl2-6.3/books/proofstyles/
/usr/lib/acl2-6.3/books/quadratic-reciprocity/
/usr/lib/acl2-6.3/books/regex/
/usr/lib/acl2-6.3/books/rtl/
/usr/lib/acl2-6.3/books/security/
/usr/lib/acl2-6.3/books/serialize/
/usr/lib/acl2-6.3/books/sorting/
/usr/lib/acl2-6.3/books/std/
/usr/lib/acl2-6.3/books/str/
/usr/lib/acl2-6.3/books/symbolic/
/usr/lib/acl2-6.3/books/system/
/usr/lib/acl2-6.3/books/taspi/
/usr/lib/acl2-6.3/books/tau/
/usr/lib/acl2-6.3/books/textbook/
/usr/lib/acl2-6.3/books/tools/
/usr/lib/acl2-6.3/books/translators/
/usr/lib/acl2-6.3/books/tutorial-problems/
/usr/lib/acl2-6.3/books/unicode/
/usr/lib/acl2-6.3/books/wp-gen/
/usr/lib/acl2-6.3/books/xdoc/