C11112331312111112111133133313331333132313233313331312111133112211232233121   >>    C1111233131211111211113313331333133313231323331333131211113311221123223312   <<    C11112331312111112111133133313331333132313233313331312111133112211232233123   >>      C11112331312111112111133133313331333132313233313331312111133112211232233122   >>