/usr/ is in ruby-sexp-processor 4.4.4-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/
/usr/share/doc/ruby-sexp-processor/
/usr/lib/ruby/vendor_ruby/sexp.rb
/usr/share/doc/ruby-sexp-processor/changelog.Debian.gz
/usr/lib/ruby/vendor_ruby/pt_testcase.rb
/usr/lib/ruby/vendor_ruby/sexp_processor.rb
/usr/lib/ruby/vendor_ruby/composite_sexp_processor.rb
/usr/share/
/usr/lib/
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/unique.rb
/usr/share/doc/ruby-sexp-processor/copyright
/usr/share/doc/ruby-sexp-processor/README.txt
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/all/
/usr/share/rubygems-integration/all/specifications/
/usr/share/rubygems-integration/all/specifications/sexp_processor-4.4.4.gemspec