code: def contains(self, desired):
          '''Return the filter closure fully constructed.'''
          field = self.__field
          def aFilter(testDictionary):
              return (desired in testDictionary[field])
          return aFiltef contains(self, desired):
          '''Return the filter closure fully constructed.'''
          field = self.__field
          def aFilter(testDictionary):
              return (desired in testDictionary[field])
          return aFilter
docs: Return the filter closure fully constructed.