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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _ParseVValueString( self, parser_mediator, data, user_information_descriptor):
 """Parses a V value string. Args: parser_mediator (ParserMediator):
 mediates interactions between parsers and other components, such as storage and dfvfs. data (bytes):
 Windows Registry V value data. user_information_descriptor (user_information_descriptor):
 V value user information descriptor. Returns: str: string value stored in the Windows Registry V value data. """

    data_start_offset = (
        user_information_descriptor.offset + self._V_VALUE_STRINGS_OFFSET)
    data_end_offset = data_start_offset + user_information_descriptor.size
    descriptor_data = data[data_start_offset:data_end_offset]

    try:
      username = descriptor_data.decode('utf-16-le')
    except (UnicodeDecodeError, UnicodeEncodeError) as exception:
      username = descriptor_data.decode('utf-16-le', errors='replace')
      parser_mediator.ProduceExtractionWarning((
          'unable to decode V value string with error: {0!s}. Characters '
          'that cannot be decoded will be replaced with "?" or '
          '"\\ufffd".').format(exception))

    return username