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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_benchmark_handler(self, last_trade, freq='minutely'):
        '''
        Setup a custom benchmark handler or let zipline manage it
        '''
        return LiveBenchmark(
            last_trade, frequency=freq).surcharge_market_data \
            if utils.is_live(last_trade) else None