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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_transactions(self):
 """Fetches transaction history. :rtype: ``list`` of ``str`` transaction IDs """

        self.transactions[:] = NetworkAPI.get_transactions(self.address)
        if self.segwit_address:
            self.transactions += NetworkAPI.get_transactions(self.segwit_address)
        return self.transactions