D1212121212131323223313233231323331313231333131323211331323111111   >>    D121212121213132322331323323132333131323133313132321133132311111   <<    D1212121212131323223313233231323331313231333131323211331323111113   >>      D1212121212131323223313233231323331313231333131323211331323111112   >>