/usr/share/acl2-4.3/books/unicode/ is in acl2-books-source 4.3-3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/acl2-4.3/books/unicode/app.lisp
/usr/share/acl2-4.3/books/unicode/append.lisp
/usr/share/acl2-4.3/books/unicode/base10-digit-charp.lisp
/usr/share/acl2-4.3/books/unicode/close-input-channel.lisp
/usr/share/acl2-4.3/books/unicode/coerce.lisp
/usr/share/acl2-4.3/books/unicode/combine.lisp
/usr/share/acl2-4.3/books/unicode/consless-listp.lisp
/usr/share/acl2-4.3/books/unicode/explode-atom.lisp
/usr/share/acl2-4.3/books/unicode/explode-nonnegative-integer.lisp
/usr/share/acl2-4.3/books/unicode/file-measure.lisp
/usr/share/acl2-4.3/books/unicode/flatten.lisp
/usr/share/acl2-4.3/books/unicode/intern-in-package-of-symbol.lisp
/usr/share/acl2-4.3/books/unicode/list-defuns.lisp
/usr/share/acl2-4.3/books/unicode/list-fix.lisp
/usr/share/acl2-4.3/books/unicode/nat-listp.lisp
/usr/share/acl2-4.3/books/unicode/nthcdr-bytes.lisp
/usr/share/acl2-4.3/books/unicode/nthcdr.lisp
/usr/share/acl2-4.3/books/unicode/open-input-channel.lisp
/usr/share/acl2-4.3/books/unicode/open-input-channels.lisp
/usr/share/acl2-4.3/books/unicode/partition.lisp
/usr/share/acl2-4.3/books/unicode/peek-char.lisp
/usr/share/acl2-4.3/books/unicode/prefixp.lisp
/usr/share/acl2-4.3/books/unicode/read-byte.lisp
/usr/share/acl2-4.3/books/unicode/read-char.lisp
/usr/share/acl2-4.3/books/unicode/read-file-bytes.lisp
/usr/share/acl2-4.3/books/unicode/read-file-characters.lisp
/usr/share/acl2-4.3/books/unicode/read-file-objects.lisp
/usr/share/acl2-4.3/books/unicode/read-ints.lisp
/usr/share/acl2-4.3/books/unicode/read-object.lisp
/usr/share/acl2-4.3/books/unicode/read-utf8.lisp
/usr/share/acl2-4.3/books/unicode/repeat.lisp
/usr/share/acl2-4.3/books/unicode/rev.lisp
/usr/share/acl2-4.3/books/unicode/revappend.lisp
/usr/share/acl2-4.3/books/unicode/reverse.lisp
/usr/share/acl2-4.3/books/unicode/sign-byte.lisp
/usr/share/acl2-4.3/books/unicode/signed-byte-listp.lisp
/usr/share/acl2-4.3/books/unicode/string-append.lisp
/usr/share/acl2-4.3/books/unicode/sum-list.lisp
/usr/share/acl2-4.3/books/unicode/take-bytes.lisp
/usr/share/acl2-4.3/books/unicode/take.lisp
/usr/share/acl2-4.3/books/unicode/test-performance/
/usr/share/acl2-4.3/books/unicode/test-performance/tests.lisp
/usr/share/acl2-4.3/books/unicode/test-performance/timing.lisp
/usr/share/acl2-4.3/books/unicode/test-performance/unicode.lisp
/usr/share/acl2-4.3/books/unicode/two-nats-measure.lisp
/usr/share/acl2-4.3/books/unicode/uchar.lisp
/usr/share/acl2-4.3/books/unicode/unsigned-byte-listp.lisp
/usr/share/acl2-4.3/books/unicode/update-state.lisp
/usr/share/acl2-4.3/books/unicode/utf8-decode.lisp
/usr/share/acl2-4.3/books/unicode/utf8-encode.lisp
/usr/share/acl2-4.3/books/unicode/utf8-table35.lisp
/usr/share/acl2-4.3/books/unicode/utf8-table36.lisp
/usr/share/acl2-4.3/books/unicode/z-listp.lisp