code: def splits(self):
          ''' Splits '''
          if not self.__splits_aggregate:
              self.__splits_aggregate = SplitsAggregate(self.book)
          return self.__splits_aggregatf splits(self):
          ''' Splits '''
          if not self.__splits_aggregate:
              self.__splits_aggregate = SplitsAggregate(self.book)
          return self.__splits_aggregate
docs: Splits