MD5 (cal.rb/cal.rb) = 89a4eabee1e00de929cd944698a9ea7e
MD5 (cal.rb/Calendar.rb) = b51bb285fde892ccbdedb0ad8d7d53f9
MD5 (cal.rb/era_name) = 2c3c6a4de0d7d8a2101fbe7165509982