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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_text(self):

 """Return all joined text from each subtree"""

        if self.__fulltext:
            return self.__fulltext
        else:
            self.__fulltext = "\n\n".join(text.get_text()
                                          for text in self.__subtrees)
            return self.__fulltext