C2221232323213331311331333133313231333132313331333121313233121232223221   >>    C222123232321333131133133313331323133313231333133312131323312123222322   <<    C2221232323213331311331333133313231333132313331333121313233121232223223   >>      C2221232323213331311331333133313231333132313331333121313233121232223222   >>