C21231322221311331311211312111133132313223313331322331313311221   >>    C2123132222131133131121131211113313231322331333132233131331122   <<    C21231322221311331311211312111133132313223313331322331313311223   >>      C21231322221311331311211312111133132313223313331322331313311222   >>