D1212121212131323223313233231323133313231323331322231323132313232111   >>    D121212121213132322331323323132313331323132333132223132313231323211   <<    D1212121212131323223313233231323133313231323331322231323132313232113   >>      D1212121212131323223313233231323133313231323331322231323132313232112   >>