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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 getSubgraphFieldList(self, parent_name, graph_name):
 """Returns list of names of fields for subgraph with name graph_name and parent graph with name parent_name. @param parent_name: Root Graph Name @param graph_name: Subgraph Name @return: List of field names for subgraph. """

        graph = self._getSubGraph(parent_name, graph_name, True)
        return graph.getFieldList()