C11112331312111112111133133313331333133112213223211113313232212121   >>    C1111233131211111211113313331333133313311221322321111331323221212   <<    C11112331312111112111133133313331333133112213223211113313232212123   >>      C11112331312111112111133133313331333133112213223211113313232212122   >>