<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def false_repr(self, value):
 """Validate and set the logical false representation."""

        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.')