(ask '(who ordered from sears))
  ((UT) (HP) (UT) (MCC))
(ask '(who ordered blimps))
  ((UT))
(ask '(what customers in austin
            ordered before april))
  ((UT))
(ask '(what customers in austin
            ordered after march))
  ((MCC) (MCC) (UT) (HP) (MCC))
(ask '(who ordered from acme
         after april))
  ((HP))
(ask '(who ordered tires from sears))
  ((HP) (UT))
(ask '(who ordered tires))
  ((HP) (UT) (MCC) (UT))
(ask '(what customers in austin
            ordered widgets in april))
  ((MCC) (MCC))

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