C12121212311232322331313232233132333132313133313113313231232211   >>    C1212121231123232233131323223313233313231313331311331323123221   <<    C12121212311232322331313232233132333132313133313113313231232213   >>      C12121212311232322331313232233132333132313133313113313231232212   >>