D1212121212131323331312323132322331313232233132313223313133112321   >>    D121212121213132333131232313232233131323223313231322331313311232   <<    D1212121212131323331312323132322331313232233132313223313133112323   >>      D1212121212131323331312323132322331313232233132313223313133112322   >>