D1212121212131323331312323132322331313232233132313223313233313231333131232311   >>    D121212121213132333131232313232233131323223313231322331323331323133313123231   <<    D1212121212131323331312323132322331313232233132313223313233313231333131232313   >>      D1212121212131323331312323132322331313232233132313223313233313231333131232312   >>