/usr/share/acl2-7.1/books/arithmetic-3/pass1/ is in acl2-books-source 7.1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/acl2-7.1/books/arithmetic-3/pass1/basic-arithmetic-helper.lisp
/usr/share/acl2-7.1/books/arithmetic-3/pass1/basic-arithmetic.lisp
/usr/share/acl2-7.1/books/arithmetic-3/pass1/expt-helper.lisp
/usr/share/acl2-7.1/books/arithmetic-3/pass1/expt.lisp
/usr/share/acl2-7.1/books/arithmetic-3/pass1/inequalities.lisp
/usr/share/acl2-7.1/books/arithmetic-3/pass1/mini-theories.lisp
/usr/share/acl2-7.1/books/arithmetic-3/pass1/non-linear.lisp
/usr/share/acl2-7.1/books/arithmetic-3/pass1/num-and-denom-helper.lisp
/usr/share/acl2-7.1/books/arithmetic-3/pass1/numerator-and-denominator.lisp
/usr/share/acl2-7.1/books/arithmetic-3/pass1/prefer-times.lisp
/usr/share/acl2-7.1/books/arithmetic-3/pass1/top.lisp