C12121212311232322331313232233132333132333132233131232313232212111   >>    C1212121231123232233131323223313233313233313223313123231323221211   <<    C12121212311232322331313232233132333132333132233131232313232212113   >>      C12121212311232322331313232233132333132333132233131232313232212112   >>