C2221232323213331311331333133313231333132313232222121223133312211   >>    C222123232321333131133133313331323133313231323222212122313331221   <<    C2221232323213331311331333133313231333132313232222121223133312213   >>      C2221232323213331311331333133313231333132313232222121223133312212   >>