/usr/share/acl2-6.3/books/coi/osets/ is in acl2-books 6.3-5.
This file is owned by root:root, with mode 0o755.
..
/usr/share/acl2-6.3/books/coi/osets/computed-hints.o
/usr/share/acl2-6.3/books/coi/osets/conversions.o
/usr/share/acl2-6.3/books/coi/osets/extras.o
/usr/share/acl2-6.3/books/coi/osets/fast.o
/usr/share/acl2-6.3/books/coi/osets/instance.o
/usr/share/acl2-6.3/books/coi/osets/listsets.o
/usr/share/acl2-6.3/books/coi/osets/map.o
/usr/share/acl2-6.3/books/coi/osets/membership.o
/usr/share/acl2-6.3/books/coi/osets/multiappend.o
/usr/share/acl2-6.3/books/coi/osets/multicons.o
/usr/share/acl2-6.3/books/coi/osets/outer.o
/usr/share/acl2-6.3/books/coi/osets/primitives.o
/usr/share/acl2-6.3/books/coi/osets/quantify.o
/usr/share/acl2-6.3/books/coi/osets/set-order.o
/usr/share/acl2-6.3/books/coi/osets/set-processor.o
/usr/share/acl2-6.3/books/coi/osets/sets.o
/usr/share/acl2-6.3/books/coi/osets/sort.o