D1212121212131323223313233231323133313231323331311331323131323223312111   >>    D121212121213132322331323323132313331323132333131133132313132322331211   <<    D1212121212131323223313233231323133313231323331311331323131323223312113   >>      D1212121212131323223313233231323133313231323331311331323131323223312112   >>