/usr/share/acl2-7.2dfsg/books/coi/nary/ is in acl2-books-source 7.2dfsg-3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/acl2-7.2dfsg/books/coi/nary/cert.acl2
/usr/share/acl2-7.2dfsg/books/coi/nary/example.lisp
/usr/share/acl2-7.2dfsg/books/coi/nary/example2.acl2
/usr/share/acl2-7.2dfsg/books/coi/nary/example2.lisp
/usr/share/acl2-7.2dfsg/books/coi/nary/nary-mod.lisp
/usr/share/acl2-7.2dfsg/books/coi/nary/nary.lisp
/usr/share/acl2-7.2dfsg/books/coi/nary/new.lisp
/usr/share/acl2-7.2dfsg/books/coi/nary/nth-rules.lisp
/usr/share/acl2-7.2dfsg/books/coi/nary/ordinal-order.lisp
/usr/share/acl2-7.2dfsg/books/coi/nary/rewrite-equal-hint.lisp
/usr/share/acl2-7.2dfsg/books/coi/nary/skip-rewrite.acl2
/usr/share/acl2-7.2dfsg/books/coi/nary/skip-rewrite.lisp
/usr/share/acl2-7.2dfsg/books/coi/nary/test.lisp