C21231322221311331311211312111133132313223313331322331311331333133313231123111   >>    C2123132222131133131121131211113313231322331333132233131133133313331323112311   <<    C21231322221311331311211312111133132313223313331322331311331333133313231123113   >>      C21231322221311331311211312111133132313223313331322331311331333133313231123112   >>