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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 DEFINE_string( # pylint: disable=invalid-name,redefined-builtin name, default, help, flag_values=_flagvalues.FLAGS, **args):
 """Registers a flag whose value can be any string."""

  parser = _argument_parser.ArgumentParser()
  serializer = _argument_parser.ArgumentSerializer()
  DEFINE(parser, name, default, help, flag_values, serializer, **args)