C1112212323132313132313132313232233132333133313233231323132312111   >>    C111221232313231313231313231323223313233313331323323132313231211   <<    C1112212323132313132313132313232233132333133313233231323132312113   >>      C1112212323132313132313132313232233132333133313233231323132312112   >>