/usr/share/acl2-6.3/books/tools/ is in acl2-books-certs 6.3-5.
This file is owned by root:root, with mode 0o755.
..
/usr/share/acl2-6.3/books/tools/advise.cert
/usr/share/acl2-6.3/books/tools/bstar.cert
/usr/share/acl2-6.3/books/tools/case-splitting-rules.cert
/usr/share/acl2-6.3/books/tools/clone-stobj.cert
/usr/share/acl2-6.3/books/tools/cws.cert
/usr/share/acl2-6.3/books/tools/def-functional-instance.cert
/usr/share/acl2-6.3/books/tools/defconsts.cert
/usr/share/acl2-6.3/books/tools/defevaluator-fast.cert
/usr/share/acl2-6.3/books/tools/define-keyed-function.cert
/usr/share/acl2-6.3/books/tools/defined-const.cert
/usr/share/acl2-6.3/books/tools/defmacfun.cert
/usr/share/acl2-6.3/books/tools/defredundant.cert
/usr/share/acl2-6.3/books/tools/defsum.cert
/usr/share/acl2-6.3/books/tools/deftuple.cert
/usr/share/acl2-6.3/books/tools/do-not.cert
/usr/share/acl2-6.3/books/tools/easy-simplify.cert
/usr/share/acl2-6.3/books/tools/fake-event.cert
/usr/share/acl2-6.3/books/tools/flag.cert
/usr/share/acl2-6.3/books/tools/in-raw-mode.cert
/usr/share/acl2-6.3/books/tools/include-raw.cert
/usr/share/acl2-6.3/books/tools/lint.cert
/usr/share/acl2-6.3/books/tools/match-tree.cert
/usr/share/acl2-6.3/books/tools/mv-nth.cert
/usr/share/acl2-6.3/books/tools/oracle-eval-real.cert
/usr/share/acl2-6.3/books/tools/oracle-eval.cert
/usr/share/acl2-6.3/books/tools/pack.cert
/usr/share/acl2-6.3/books/tools/pattern-match.cert
/usr/share/acl2-6.3/books/tools/plev-ccl.cert
/usr/share/acl2-6.3/books/tools/plev.cert
/usr/share/acl2-6.3/books/tools/rulesets.cert
/usr/share/acl2-6.3/books/tools/safe-case.cert
/usr/share/acl2-6.3/books/tools/saved-errors.cert
/usr/share/acl2-6.3/books/tools/stobj-frame.cert
/usr/share/acl2-6.3/books/tools/stobj-help.cert
/usr/share/acl2-6.3/books/tools/templates.cert
/usr/share/acl2-6.3/books/tools/theory-tools.cert
/usr/share/acl2-6.3/books/tools/time-dollar-with-gc.cert
/usr/share/acl2-6.3/books/tools/trivial-ancestors-check.cert
/usr/share/acl2-6.3/books/tools/types-misc.cert
/usr/share/acl2-6.3/books/tools/with-arith5-help.cert
/usr/share/acl2-6.3/books/tools/with-quoted-forms.cert