code: def false_repr(self, value):
          
          if isinstance(value, str):
              if not (value.lower().startswith('f') or
                      value.lower().startswith('.f')):
                  raise ValueError("Logical false representation must start "
                                   "with 'F' or '.F'.")
              else:
                  self._logical_repr[0] = value
          else:
              raise TypeError('Logical false representation must be a string.')
docs: Validate and set the logical false representation.