code: def highrisk_special_prefixes(self):
          
          if self._highrisk_special_prefixes is None:
              self._highrisk_special_prefixes = HighriskSpecialPrefixList(
                  self._version,
                  iso_code=self._solution['iso_code'],
              )
          return self._highrisk_special_prefixes
docs: Access the highrisk_special_prefixes
  
          :returns: twilio.rest.voice.v1.dialing_permissions.country.highrisk_special_prefix.HighriskSpecialPrefixList
          :rtype: twilio.rest.voice.v1.dialing_permissions.country.highrisk_special_prefix.HighriskSpecialPrefixList