def add country_code, country
      country_code = country_code.to_s
      optimized_country_code_access = country_code.size

      @countries ||= {}
      @countries[optimized_country_code_access] ||= {}
      @countries[optimized_country_code_access][country_code] = country
    end
def add country_code, country
      country_code = country_code.to_s
      optimized_country_code_access = country_code.size

      @countries ||= {}
      @countries[optimized_country_code_access] ||= {}
      @countries[optimized_country_code_access][country_code] = country
    end
Add the given country to the mapping under the
 given country code.