C11112331312111112111133133313231333132313331333131313232233132213121   >>    C1111233131211111211113313331323133313231333133313131323223313221312   <<    C11112331312111112111133133313231333132313331333131313232233132213123   >>      C11112331312111112111133133313231333132313331333131313232233132213122   >>