(ask '(what customers in austin
            ordered widgets in april))

QUERYDB entry:
  Arg 1: ORDERDB
  Arg 2: (AND (EQUAL
               (GETDB (QUOTE DATE-MONTH))
               4)
              (EQUAL (GETDB (QUOTE PART))
                     (QUOTE WIDGET))
              (EQUAL
               (GETDB
                 (QUOTE CUSTOMER-CITY))
               (QUOTE AUSTIN)))
  Arg 3: (LIST (GETDB (QUOTE CUSTOMER)))

QUERYDB return value = ((MCC) (MCC))

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