<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def lookups(self):
 """ Access the Lookups Twilio Domain :returns: Lookups Twilio Domain :rtype: twilio.rest.lookups.Lookups """

        if self._lookups is None:
            from twilio.rest.lookups import Lookups
            self._lookups = Lookups(self)
        return self._lookups