/usr/share/acl2-7.1/books/arithmetic-2/ is in acl2-books 7.1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/acl2-7.1/books/arithmetic-2/floor-mod/
/usr/share/acl2-7.1/books/arithmetic-2/floor-mod/floor-mod-helper.o
/usr/share/acl2-7.1/books/arithmetic-2/floor-mod/floor-mod.o
/usr/share/acl2-7.1/books/arithmetic-2/meta/
/usr/share/acl2-7.1/books/arithmetic-2/meta/cancel-terms-helper.o
/usr/share/acl2-7.1/books/arithmetic-2/meta/cancel-terms-meta.o
/usr/share/acl2-7.1/books/arithmetic-2/meta/collect-terms-meta.o
/usr/share/acl2-7.1/books/arithmetic-2/meta/common-meta.o
/usr/share/acl2-7.1/books/arithmetic-2/meta/expt-helper.o
/usr/share/acl2-7.1/books/arithmetic-2/meta/expt.o
/usr/share/acl2-7.1/books/arithmetic-2/meta/integerp-meta.o
/usr/share/acl2-7.1/books/arithmetic-2/meta/integerp.o
/usr/share/acl2-7.1/books/arithmetic-2/meta/mini-theories.o
/usr/share/acl2-7.1/books/arithmetic-2/meta/non-linear.o
/usr/share/acl2-7.1/books/arithmetic-2/meta/numerator-and-denominator.o
/usr/share/acl2-7.1/books/arithmetic-2/meta/post.o
/usr/share/acl2-7.1/books/arithmetic-2/meta/pre.o
/usr/share/acl2-7.1/books/arithmetic-2/meta/top.o
/usr/share/acl2-7.1/books/arithmetic-2/pass1/
/usr/share/acl2-7.1/books/arithmetic-2/pass1/basic-arithmetic-helper.o
/usr/share/acl2-7.1/books/arithmetic-2/pass1/basic-arithmetic.o
/usr/share/acl2-7.1/books/arithmetic-2/pass1/expt-helper.o
/usr/share/acl2-7.1/books/arithmetic-2/pass1/expt.o
/usr/share/acl2-7.1/books/arithmetic-2/pass1/inequalities.o
/usr/share/acl2-7.1/books/arithmetic-2/pass1/mini-theories.o
/usr/share/acl2-7.1/books/arithmetic-2/pass1/numerator-and-denominator-helper.o
/usr/share/acl2-7.1/books/arithmetic-2/pass1/numerator-and-denominator.o
/usr/share/acl2-7.1/books/arithmetic-2/pass1/prefer-times.o
/usr/share/acl2-7.1/books/arithmetic-2/pass1/top.o