D1212121212131323223313233231323133313231323331311331323132232211   >>    D121212121213132322331323323132313331323132333131133132313223221   <<    D1212121212131323223313233231323133313231323331311331323132232213   >>      D1212121212131323223313233231323133313231323331311331323132232212   >>