C1231321123223331211111131211113313331333132313331333112233232122212121   >>    C123132112322333121111113121111331333133313231333133311223323212221212   <<    C1231321123223331211111131211113313331333132313331333112233232122212123   >>      C1231321123223331211111131211113313331333132313331333112233232122212122   >>