D12121212121313233313123231323223313132322331323132233131232321   >>    D1212121212131323331312323132322331313232233132313223313123232   <<    D12121212121313233313123231323223313132322331323132233131232323   >>      D12121212121313233313123231323223313132322331323132233131232322   >>