C21231322221311331311211312111133132313223313331323132233132212131   >>    C2123132222131133131121131211113313231322331333132313223313221213   <<    C21231322221311331311211312111133132313223313331323132233132212133   >>      C21231322221311331311211312111133132313223313331323132233132212132   >>