/usr/ is in ruby-memoizable 0.4.2-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/memoizable.rb
/usr/lib/ruby/vendor_ruby/memoizable/
/usr/lib/ruby/vendor_ruby/memoizable/instance_methods.rb
/usr/lib/ruby/vendor_ruby/memoizable/memory.rb
/usr/lib/ruby/vendor_ruby/memoizable/method_builder.rb
/usr/lib/ruby/vendor_ruby/memoizable/module_methods.rb
/usr/lib/ruby/vendor_ruby/memoizable/version.rb
/usr/share/
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/all/
/usr/share/rubygems-integration/all/specifications/
/usr/share/rubygems-integration/all/specifications/memoizable-0.4.2.gemspec
/usr/share/doc/
/usr/share/doc/ruby-memoizable/
/usr/share/doc/ruby-memoizable/copyright
/usr/share/doc/ruby-memoizable/README.md
/usr/share/doc/ruby-memoizable/changelog.Debian.gz