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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 governor(self):
 """ Accesses the governor node :getter: Returns the Governor node :type: corenlp_xml.dependencies.DependencyNode """

        if self._governor is None:
            governors = self._element.xpath('governor')
            if len(governors) > 0:
                self._governor = DependencyNode.load(self._graph, governors[0])
        return self._governor