/usr/share/acl2-6.3/books/centaur/esim/ is in acl2-books-certs 6.3-5.
This file is owned by root:root, with mode 0o755.
..
/usr/share/acl2-6.3/books/centaur/esim/esim-cut.cert
/usr/share/acl2-6.3/books/centaur/esim/esim-paths.cert
/usr/share/acl2-6.3/books/centaur/esim/esim-primitives.cert
/usr/share/acl2-6.3/books/centaur/esim/esim-sexpr-correct.cert
/usr/share/acl2-6.3/books/centaur/esim/esim-sexpr-support-thms.cert
/usr/share/acl2-6.3/books/centaur/esim/esim-sexpr-support.cert
/usr/share/acl2-6.3/books/centaur/esim/esim-sexpr.cert
/usr/share/acl2-6.3/books/centaur/esim/esim-spec.cert
/usr/share/acl2-6.3/books/centaur/esim/esim-vcd.cert
/usr/share/acl2-6.3/books/centaur/esim/esim-vl.cert
/usr/share/acl2-6.3/books/centaur/esim/follow-backwards.cert
/usr/share/acl2-6.3/books/centaur/esim/local-theory.cert
/usr/share/acl2-6.3/books/centaur/esim/plist.cert
/usr/share/acl2-6.3/books/centaur/esim/portcullis.cert
/usr/share/acl2-6.3/books/centaur/esim/steps.cert
/usr/share/acl2-6.3/books/centaur/esim/stv/
/usr/share/acl2-6.3/books/centaur/esim/stv/stv-compile.cert
/usr/share/acl2-6.3/books/centaur/esim/stv/stv-debug.cert
/usr/share/acl2-6.3/books/centaur/esim/stv/stv-doc.cert
/usr/share/acl2-6.3/books/centaur/esim/stv/stv-expand.cert
/usr/share/acl2-6.3/books/centaur/esim/stv/stv-run.cert
/usr/share/acl2-6.3/books/centaur/esim/stv/stv-sim.cert
/usr/share/acl2-6.3/books/centaur/esim/stv/stv-top.cert
/usr/share/acl2-6.3/books/centaur/esim/stv/stv-util.cert
/usr/share/acl2-6.3/books/centaur/esim/stv/stv-widen.cert