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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 label_maker(self):
 """ needed to defer loading of local conventions to avoid circular dependency issue """

        if (not hasattr(graphBase, '_label_maker') or
            graphBase._label_maker.local_conventions != graphBase.local_conventions):
            graphBase._label_maker = LabelMaker(graphBase.local_conventions)

        return graphBase._label_maker