/usr/share/acl2-8.0dfsg/books/hints/ is in acl2-books-source 8.0dfsg-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/acl2-8.0dfsg/books/hints/basic-tests.acl2
/usr/share/acl2-8.0dfsg/books/hints/basic-tests.lisp
/usr/share/acl2-8.0dfsg/books/hints/consider-hint-tests.acl2
/usr/share/acl2-8.0dfsg/books/hints/consider-hint-tests.lisp
/usr/share/acl2-8.0dfsg/books/hints/consider-hint.lisp
/usr/share/acl2-8.0dfsg/books/hints/hint-wrapper.lisp
/usr/share/acl2-8.0dfsg/books/hints/huet-lang-algorithm-tests.lisp
/usr/share/acl2-8.0dfsg/books/hints/huet-lang-algorithm.lisp
/usr/share/acl2-8.0dfsg/books/hints/merge-hint.lisp
/usr/share/acl2-8.0dfsg/books/hints/subgoalp.lisp
/usr/share/acl2-8.0dfsg/books/hints/use-pkg.lisp