# File lib/keystone/string_util.rb, line 61
    def self.downcase_roma_number(st)
      st.tr("ⅠⅡⅢⅣⅤⅥⅦⅧⅨⅩ", "ⅰⅱⅲⅳⅴⅵⅶⅷⅸⅹ")
    end