/usr/share/acl2-8.0dfsg/books/data-structures/ is in acl2-books-source 8.0dfsg-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/acl2-8.0dfsg/books/data-structures/alist-defthms.lisp
/usr/share/acl2-8.0dfsg/books/data-structures/alist-defuns.lisp
/usr/share/acl2-8.0dfsg/books/data-structures/alist-theory.lisp
/usr/share/acl2-8.0dfsg/books/data-structures/array1.lisp
/usr/share/acl2-8.0dfsg/books/data-structures/defalist.acl2
/usr/share/acl2-8.0dfsg/books/data-structures/defalist.lisp
/usr/share/acl2-8.0dfsg/books/data-structures/deflist.acl2
/usr/share/acl2-8.0dfsg/books/data-structures/deflist.lisp
/usr/share/acl2-8.0dfsg/books/data-structures/list-defthms.lisp
/usr/share/acl2-8.0dfsg/books/data-structures/list-defuns.lisp
/usr/share/acl2-8.0dfsg/books/data-structures/list-theory.lisp
/usr/share/acl2-8.0dfsg/books/data-structures/memories/
/usr/share/acl2-8.0dfsg/books/data-structures/memories/cert.acl2
/usr/share/acl2-8.0dfsg/books/data-structures/memories/log2.lisp
/usr/share/acl2-8.0dfsg/books/data-structures/memories/memory-impl.lisp
/usr/share/acl2-8.0dfsg/books/data-structures/memories/memory.lisp
/usr/share/acl2-8.0dfsg/books/data-structures/memories/memtree.lisp
/usr/share/acl2-8.0dfsg/books/data-structures/memories/portcullis.acl2
/usr/share/acl2-8.0dfsg/books/data-structures/memories/portcullis.lisp
/usr/share/acl2-8.0dfsg/books/data-structures/memories/private.lisp
/usr/share/acl2-8.0dfsg/books/data-structures/no-duplicates.lisp
/usr/share/acl2-8.0dfsg/books/data-structures/number-list-defthms.lisp
/usr/share/acl2-8.0dfsg/books/data-structures/number-list-defuns.lisp
/usr/share/acl2-8.0dfsg/books/data-structures/number-list-theory.lisp
/usr/share/acl2-8.0dfsg/books/data-structures/portcullis.acl2
/usr/share/acl2-8.0dfsg/books/data-structures/portcullis.lisp
/usr/share/acl2-8.0dfsg/books/data-structures/set-defthms.lisp
/usr/share/acl2-8.0dfsg/books/data-structures/set-defuns.lisp
/usr/share/acl2-8.0dfsg/books/data-structures/set-theory.lisp
/usr/share/acl2-8.0dfsg/books/data-structures/structures.acl2
/usr/share/acl2-8.0dfsg/books/data-structures/structures.lisp
/usr/share/acl2-8.0dfsg/books/data-structures/top.acl2
/usr/share/acl2-8.0dfsg/books/data-structures/top.lisp
/usr/share/acl2-8.0dfsg/books/data-structures/utilities.acl2
/usr/share/acl2-8.0dfsg/books/data-structures/utilities.lisp