/usr/share/acl2-7.1/books/arithmetic-3/ is in acl2-books 7.1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/acl2-7.1/books/arithmetic-3/bind-free/
/usr/share/acl2-7.1/books/arithmetic-3/bind-free/arithmetic-theory.o
/usr/share/acl2-7.1/books/arithmetic-3/bind-free/banner.o
/usr/share/acl2-7.1/books/arithmetic-3/bind-free/basic-helper.o
/usr/share/acl2-7.1/books/arithmetic-3/bind-free/basic.o
/usr/share/acl2-7.1/books/arithmetic-3/bind-free/building-blocks.o
/usr/share/acl2-7.1/books/arithmetic-3/bind-free/collect.o
/usr/share/acl2-7.1/books/arithmetic-3/bind-free/common.o
/usr/share/acl2-7.1/books/arithmetic-3/bind-free/default-hint.o
/usr/share/acl2-7.1/books/arithmetic-3/bind-free/integerp-meta.o
/usr/share/acl2-7.1/books/arithmetic-3/bind-free/integerp.o
/usr/share/acl2-7.1/books/arithmetic-3/bind-free/mini-theories-helper.o
/usr/share/acl2-7.1/books/arithmetic-3/bind-free/mini-theories.o
/usr/share/acl2-7.1/books/arithmetic-3/bind-free/normalize.o
/usr/share/acl2-7.1/books/arithmetic-3/bind-free/numerator-and-denominator.o
/usr/share/acl2-7.1/books/arithmetic-3/bind-free/remove-weak-inequalities.o
/usr/share/acl2-7.1/books/arithmetic-3/bind-free/simplify-helper.o
/usr/share/acl2-7.1/books/arithmetic-3/bind-free/simplify.o
/usr/share/acl2-7.1/books/arithmetic-3/bind-free/top.o
/usr/share/acl2-7.1/books/arithmetic-3/extra/
/usr/share/acl2-7.1/books/arithmetic-3/extra/ext-compat.o
/usr/share/acl2-7.1/books/arithmetic-3/extra/ext.o
/usr/share/acl2-7.1/books/arithmetic-3/extra/top-ext.o
/usr/share/acl2-7.1/books/arithmetic-3/floor-mod/
/usr/share/acl2-7.1/books/arithmetic-3/floor-mod/floor-mod.o
/usr/share/acl2-7.1/books/arithmetic-3/floor-mod/mod-expt-fast.o
/usr/share/acl2-7.1/books/arithmetic-3/pass1/
/usr/share/acl2-7.1/books/arithmetic-3/pass1/basic-arithmetic-helper.o
/usr/share/acl2-7.1/books/arithmetic-3/pass1/basic-arithmetic.o
/usr/share/acl2-7.1/books/arithmetic-3/pass1/expt-helper.o
/usr/share/acl2-7.1/books/arithmetic-3/pass1/expt.o
/usr/share/acl2-7.1/books/arithmetic-3/pass1/inequalities.o
/usr/share/acl2-7.1/books/arithmetic-3/pass1/mini-theories.o
/usr/share/acl2-7.1/books/arithmetic-3/pass1/non-linear.o
/usr/share/acl2-7.1/books/arithmetic-3/pass1/num-and-denom-helper.o
/usr/share/acl2-7.1/books/arithmetic-3/pass1/numerator-and-denominator.o
/usr/share/acl2-7.1/books/arithmetic-3/pass1/prefer-times.o
/usr/share/acl2-7.1/books/arithmetic-3/pass1/top.o
/usr/share/acl2-7.1/books/arithmetic-3/top.o