/usr/share/acl2-8.0dfsg/books/centaur/bitops/ is in acl2-books-source 8.0dfsg-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/acl2-8.0dfsg/books/centaur/bitops/ash-bounds.lisp
/usr/share/acl2-8.0dfsg/books/centaur/bitops/cert.acl2
/usr/share/acl2-8.0dfsg/books/centaur/bitops/congruences.lisp
/usr/share/acl2-8.0dfsg/books/centaur/bitops/contrib/
/usr/share/acl2-8.0dfsg/books/centaur/bitops/contrib/ash-of-a-constant.lisp
/usr/share/acl2-8.0dfsg/books/centaur/bitops/contrib/log2.lisp
/usr/share/acl2-8.0dfsg/books/centaur/bitops/defaults.lisp
/usr/share/acl2-8.0dfsg/books/centaur/bitops/equal-by-logbitp.lisp
/usr/share/acl2-8.0dfsg/books/centaur/bitops/extra-defs.lisp
/usr/share/acl2-8.0dfsg/books/centaur/bitops/fast-logext.lisp
/usr/share/acl2-8.0dfsg/books/centaur/bitops/fast-logrev.acl2
/usr/share/acl2-8.0dfsg/books/centaur/bitops/fast-logrev.lisp
/usr/share/acl2-8.0dfsg/books/centaur/bitops/fast-rotate.lisp
/usr/share/acl2-8.0dfsg/books/centaur/bitops/floor.lisp
/usr/share/acl2-8.0dfsg/books/centaur/bitops/ihs-extensions.lisp
/usr/share/acl2-8.0dfsg/books/centaur/bitops/ihsext-basics.lisp
/usr/share/acl2-8.0dfsg/books/centaur/bitops/install-bit.lisp
/usr/share/acl2-8.0dfsg/books/centaur/bitops/integer-length.lisp
/usr/share/acl2-8.0dfsg/books/centaur/bitops/limited-shifts.lisp
/usr/share/acl2-8.0dfsg/books/centaur/bitops/logbitp-bounds.lisp
/usr/share/acl2-8.0dfsg/books/centaur/bitops/logbitp-mismatch.lisp
/usr/share/acl2-8.0dfsg/books/centaur/bitops/merge.lisp
/usr/share/acl2-8.0dfsg/books/centaur/bitops/parity.lisp
/usr/share/acl2-8.0dfsg/books/centaur/bitops/part-install.lisp
/usr/share/acl2-8.0dfsg/books/centaur/bitops/part-select.lisp
/usr/share/acl2-8.0dfsg/books/centaur/bitops/portcullis.acl2
/usr/share/acl2-8.0dfsg/books/centaur/bitops/portcullis.lisp
/usr/share/acl2-8.0dfsg/books/centaur/bitops/rotate.acl2
/usr/share/acl2-8.0dfsg/books/centaur/bitops/rotate.lisp
/usr/share/acl2-8.0dfsg/books/centaur/bitops/saturate.lisp
/usr/share/acl2-8.0dfsg/books/centaur/bitops/signed-byte-p.lisp
/usr/share/acl2-8.0dfsg/books/centaur/bitops/top.lisp
/usr/share/acl2-8.0dfsg/books/centaur/bitops/trailing-0-count.lisp
/usr/share/acl2-8.0dfsg/books/centaur/bitops/width-find-rule.lisp