/usr/share/acl2-8.0dfsg/books/defexec/ is in acl2-books-source 8.0dfsg-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/acl2-8.0dfsg/books/defexec/dag-unification/
/usr/share/acl2-8.0dfsg/books/defexec/dag-unification/basic.lisp
/usr/share/acl2-8.0dfsg/books/defexec/dag-unification/dag-unification-l.lisp
/usr/share/acl2-8.0dfsg/books/defexec/dag-unification/dag-unification-rules.lisp
/usr/share/acl2-8.0dfsg/books/defexec/dag-unification/dag-unification-st.lisp
/usr/share/acl2-8.0dfsg/books/defexec/dag-unification/dags.lisp
/usr/share/acl2-8.0dfsg/books/defexec/dag-unification/list-unification-rules.lisp
/usr/share/acl2-8.0dfsg/books/defexec/dag-unification/matching.lisp
/usr/share/acl2-8.0dfsg/books/defexec/dag-unification/subsumption-subst.lisp
/usr/share/acl2-8.0dfsg/books/defexec/dag-unification/subsumption.lisp
/usr/share/acl2-8.0dfsg/books/defexec/dag-unification/terms-as-dag.lisp
/usr/share/acl2-8.0dfsg/books/defexec/dag-unification/terms-dag-stobj.lisp
/usr/share/acl2-8.0dfsg/books/defexec/dag-unification/terms.lisp
/usr/share/acl2-8.0dfsg/books/defexec/defpun-exec/
/usr/share/acl2-8.0dfsg/books/defexec/defpun-exec/defpun-exec.lisp
/usr/share/acl2-8.0dfsg/books/defexec/find-path/
/usr/share/acl2-8.0dfsg/books/defexec/find-path/fpst.lisp
/usr/share/acl2-8.0dfsg/books/defexec/find-path/graph/
/usr/share/acl2-8.0dfsg/books/defexec/find-path/graph/find-path1.lisp
/usr/share/acl2-8.0dfsg/books/defexec/find-path/graph/find-path2.lisp
/usr/share/acl2-8.0dfsg/books/defexec/find-path/graph/find-path3.lisp
/usr/share/acl2-8.0dfsg/books/defexec/find-path/graph/helpers.lisp
/usr/share/acl2-8.0dfsg/books/defexec/find-path/graph/linear-find-path.lisp
/usr/share/acl2-8.0dfsg/books/defexec/find-path/run-fpst.lisp
/usr/share/acl2-8.0dfsg/books/defexec/ordinals/
/usr/share/acl2-8.0dfsg/books/defexec/ordinals/supporting-ordinals.lisp
/usr/share/acl2-8.0dfsg/books/defexec/other-apps/
/usr/share/acl2-8.0dfsg/books/defexec/other-apps/misc/
/usr/share/acl2-8.0dfsg/books/defexec/other-apps/misc/memos.lisp
/usr/share/acl2-8.0dfsg/books/defexec/other-apps/misc/stobjsim.lisp
/usr/share/acl2-8.0dfsg/books/defexec/other-apps/qsort/
/usr/share/acl2-8.0dfsg/books/defexec/other-apps/qsort/extraction.lisp
/usr/share/acl2-8.0dfsg/books/defexec/other-apps/qsort/final-theorem.lisp
/usr/share/acl2-8.0dfsg/books/defexec/other-apps/qsort/first-last.lisp
/usr/share/acl2-8.0dfsg/books/defexec/other-apps/qsort/intermediate-program.lisp
/usr/share/acl2-8.0dfsg/books/defexec/other-apps/qsort/intermediate-to-spec.lisp
/usr/share/acl2-8.0dfsg/books/defexec/other-apps/qsort/load-extract.lisp
/usr/share/acl2-8.0dfsg/books/defexec/other-apps/qsort/merge-intermediate.lisp
/usr/share/acl2-8.0dfsg/books/defexec/other-apps/qsort/nth-update-nth.lisp
/usr/share/acl2-8.0dfsg/books/defexec/other-apps/qsort/permutations.lisp
/usr/share/acl2-8.0dfsg/books/defexec/other-apps/qsort/programs.lisp
/usr/share/acl2-8.0dfsg/books/defexec/other-apps/qsort/sort-qs-properties.lisp
/usr/share/acl2-8.0dfsg/books/defexec/other-apps/qsort/spec-properties.lisp
/usr/share/acl2-8.0dfsg/books/defexec/other-apps/qsort/split-qs-properties.lisp
/usr/share/acl2-8.0dfsg/books/defexec/other-apps/qsort/total-order.lisp
/usr/share/acl2-8.0dfsg/books/defexec/other-apps/records/
/usr/share/acl2-8.0dfsg/books/defexec/other-apps/records/inline.lisp
/usr/share/acl2-8.0dfsg/books/defexec/other-apps/records/records.lisp
/usr/share/acl2-8.0dfsg/books/defexec/other-apps/records/recordsim.lisp
/usr/share/acl2-8.0dfsg/books/defexec/reflexive/
/usr/share/acl2-8.0dfsg/books/defexec/reflexive/reflexive.lisp