D1212121212131323331312323132322331313232233132313223313331312323132322121   >>    D121212121213132333131232313232233131323223313231322331333131232313232212   <<    D1212121212131323331312323132322331313232233132313223313331312323132322123   >>      D1212121212131323331312323132322331313232233132313223313331312323132322122   >>