C2221232323213331311331333133313231333132313331333322313213212121   >>    C222123232321333131133133313331323133313231333133332231321321212   <<    C2221232323213331311331333133313231333132313331333322313213212123   >>      C2221232323213331311331333133313231333132313331333322313213212122   >>