C11111333133313232233133313331333133313331311331333231323131111   >>    C1111133313331323223313331333133313331333131133133323132313111   <<    C11111333133313232233133313331333133313331311331333231323131113   >>      C11111333133313232233133313331333133313331311331333231323131112   >>