code: def list_config_variables(self, offset):
          
  
          names = sorted(self._config_variables)
          names = names[offset:offset + 9]
          count = len(names)
  
          if len(names) < 9:
              names += [0]*(9 - count)
  
          return [count] + names
docs: List defined config variables up to 9 at a time.