C2221232323213331311331333133313231333132313331333121313231332211   >>    C222123232321333131133133313331323133313231333133312131323133221   <<    C2221232323213331311331333133313231333132313331333121313231332213   >>      C2221232323213331311331333133313231333132313331333121313231332212   >>