C1112212323132313132313132313232233132333133313232332313231311211   >>    C111221232313231313231313231323223313233313331323233231323131121   <<    C1112212323132313132313132313232233132333133313232332313231311213   >>      C1112212323132313132313132313232233132333133313232332313231311212   >>