D12121212121313231311331323112331323223313331333131232313232111   >>    D1212121212131323131133132311233132322331333133313123231323211   <<    D12121212121313231311331323112331323223313331333131232313232113   >>      D12121212121313231311331323112331323223313331333131232313232112   >>