C12121212311232322331313232233132333132333132233131232313232221   >>    C1212121231123232233131323223313233313233313223313123231323222   <<    C12121212311232322331313232233132333132333132233131232313232223   >>      C12121212311232322331313232233132333132333132233131232313232222   >>