D1212121212131323331312323132322331313232233132313223313331333132322131   >>    D121212121213132333131232313232233131323223313231322331333133313232213   <<    D1212121212131323331312323132322331313232233132313223313331333132322133   >>      D1212121212131323331312323132322331313232233132313223313331333132322132   >>