/usr/share/acl2-7.2dfsg/books/defexec/other-apps/ is in acl2-books-source 7.2dfsg-3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/acl2-7.2dfsg/books/defexec/other-apps/misc/
/usr/share/acl2-7.2dfsg/books/defexec/other-apps/misc/memos.lisp
/usr/share/acl2-7.2dfsg/books/defexec/other-apps/misc/stobjsim.lisp
/usr/share/acl2-7.2dfsg/books/defexec/other-apps/qsort/
/usr/share/acl2-7.2dfsg/books/defexec/other-apps/qsort/extraction.lisp
/usr/share/acl2-7.2dfsg/books/defexec/other-apps/qsort/final-theorem.lisp
/usr/share/acl2-7.2dfsg/books/defexec/other-apps/qsort/first-last.lisp
/usr/share/acl2-7.2dfsg/books/defexec/other-apps/qsort/intermediate-program.lisp
/usr/share/acl2-7.2dfsg/books/defexec/other-apps/qsort/intermediate-to-spec.lisp
/usr/share/acl2-7.2dfsg/books/defexec/other-apps/qsort/load-extract.lisp
/usr/share/acl2-7.2dfsg/books/defexec/other-apps/qsort/merge-intermediate.lisp
/usr/share/acl2-7.2dfsg/books/defexec/other-apps/qsort/nth-update-nth.lisp
/usr/share/acl2-7.2dfsg/books/defexec/other-apps/qsort/permutations.lisp
/usr/share/acl2-7.2dfsg/books/defexec/other-apps/qsort/programs.lisp
/usr/share/acl2-7.2dfsg/books/defexec/other-apps/qsort/sort-qs-properties.lisp
/usr/share/acl2-7.2dfsg/books/defexec/other-apps/qsort/spec-properties.lisp
/usr/share/acl2-7.2dfsg/books/defexec/other-apps/qsort/split-qs-properties.lisp
/usr/share/acl2-7.2dfsg/books/defexec/other-apps/qsort/total-order.lisp
/usr/share/acl2-7.2dfsg/books/defexec/other-apps/records/
/usr/share/acl2-7.2dfsg/books/defexec/other-apps/records/inline.lisp
/usr/share/acl2-7.2dfsg/books/defexec/other-apps/records/records.lisp
/usr/share/acl2-7.2dfsg/books/defexec/other-apps/records/recordsim.lisp