C11112331312111112111133133313331333133313223223313331321123233313231221   >>    C1111233131211111211113313331333133313331322322331333132112323331323122   <<    C11112331312111112111133133313331333133313223223313331321123233313231223   >>      C11112331312111112111133133313331333133313223223313331321123233313231222   >>