C2221232323213331311331333133313231333132313331333121313232313123212121   >>    C222123232321333131133133313331323133313231333133312131323231312321212   <<    C2221232323213331311331333133313231333132313331333121313232313123212123   >>      C2221232323213331311331333133313231333132313331333121313232313123212122   >>