C11111333133313232233133313331333131133131211113313121333133313111   >>    C1111133313331323223313331333133313113313121111331312133313331311   <<    C11111333133313232233133313331333131133131211113313121333133313113   >>      C11111333133313232233133313331333131133131211113313121333133313112   >>