C12121223131323223313132322331323132313112123121311331323132211   >>    C1212122313132322331313232233132313231311212312131133132313221   <<    C12121223131323223313132322331323132313112123121311331323132213   >>      C12121223131323223313132322331323132313112123121311331323132212   >>