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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 runSearchFeatures(self, request):
 """ Returns a SearchFeaturesResponse for the specified SearchFeaturesRequest object. :param request: JSON string representing searchFeaturesRequest :return: JSON string representing searchFeatureResponse """

        return self.runSearchRequest(
            request, protocol.SearchFeaturesRequest,
            protocol.SearchFeaturesResponse,
            self.featuresGenerator)