C11112331312111112111133133313331333132323213331333133313331311223132213121   >>    C1111233131211111211113313331333133313232321333133313331333131122313221312   <<    C11112331312111112111133133313331333132323213331333133313331311223132213123   >>      C11112331312111112111133133313331333132323213331333133313331311223132213122   >>