C11111333133313232233133313331333131121133131133133313232221212121   >>    C1111133313331323223313331333133313112113313113313331323222121212   <<    C11111333133313232233133313331333131121133131133133313232221212123   >>      C11111333133313232233133313331333131121133131133133313232221212122   >>