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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 _get_args(self):
 """ Lazily evaluate the args. """

        if not hasattr(self, '_args_evaled'):
            # cache the args in case handler is re-invoked due to flags change
            self._args_evaled = list(chain.from_iterable(self._args))
        return self._args_evaled