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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 accounts(self):
 """ Access the Accounts Twilio Domain :returns: Accounts Twilio Domain :rtype: twilio.rest.accounts.Accounts """

        if self._accounts is None:
            from twilio.rest.accounts import Accounts
            self._accounts = Accounts(self)
        return self._accounts