C12121212311232322331313232233132313233313232223132313231211231   >>    C1212121231123232233131323223313231323331323222313231323121123   <<    C12121212311232322331313232233132313233313232223132313231211233   >>      C12121212311232322331313232233132313233313232223132313231211232   >>