C22212323232133313113313331333132313331323132322221212233232123221   >>    C2221232323213331311331333133313231333132313232222121223323212322   <<    C22212323232133313113313331333132313331323132322221212233232123223   >>      C22212323232133313113313331333132313331323132322221212233232123222   >>