MD5 (cal.rb-1.16/cal.rb) = c9f183f6cc44530958a31ef2f5c232a7
MD5 (cal.rb-1.16/Calendar.rb) = 2d43027908232ea1d17f426fd6a459ce
MD5 (cal.rb-1.16/era_name) = 2c3c6a4de0d7d8a2101fbe7165509982