/usr/ is in ruby-email-reply-trimmer 0.1.6-1.
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/email_reply_trimmer/
/usr/lib/ruby/vendor_ruby/email_reply_trimmer/delimiter_matcher.rb
/usr/lib/ruby/vendor_ruby/email_reply_trimmer/email_header_matcher.rb
/usr/lib/ruby/vendor_ruby/email_reply_trimmer/embedded_email_matcher.rb
/usr/lib/ruby/vendor_ruby/email_reply_trimmer/empty_line_matcher.rb
/usr/lib/ruby/vendor_ruby/email_reply_trimmer/quote_matcher.rb
/usr/lib/ruby/vendor_ruby/email_reply_trimmer/signature_matcher.rb
/usr/lib/ruby/vendor_ruby/email_reply_trimmer.rb
/usr/share/
/usr/share/doc/
/usr/share/doc/ruby-email-reply-trimmer/
/usr/share/doc/ruby-email-reply-trimmer/README.md
/usr/share/doc/ruby-email-reply-trimmer/changelog.Debian.gz
/usr/share/doc/ruby-email-reply-trimmer/copyright
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/all/
/usr/share/rubygems-integration/all/specifications/
/usr/share/rubygems-integration/all/specifications/email_reply_trimmer-0.1.6.gemspec