C1231321123223331211111131211113313331333133313223223312232222212121   >>    C123132112322333121111113121111331333133313331322322331223222221212   <<    C1231321123223331211111131211113313331333133313223223312232222212123   >>      C1231321123223331211111131211113313331333133313223223312232222212122   >>