MD5 (cal.rb-0.21/cal.rb) = d4ef14a378adcf91628ac156cba2396e
MD5 (cal.rb-0.21/Calendar.rb) = 76fd7a954e26d4ae43f87f721241dd4a
MD5 (cal.rb-0.21/era_name) = 2c3c6a4de0d7d8a2101fbe7165509982