C11112331312111112111133133313331333132323213331333132233132322121211   >>    C1111233131211111211113313331333133313232321333133313223313232212121   <<    C11112331312111112111133133313331333132323213331333132233132322121213   >>      C11112331312111112111133133313331333132323213331333132233132322121212   >>