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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 load_streets(self, filename):
 """ Load up all streets in lowercase for easier matching. The file should have one street per line, with no extra characters. This isn't strictly required, but will vastly increase the accuracy. """

        with open(filename, 'r') as f:
            for line in f:
                self.streets.append(line.strip().lower())