C1111233131211111211113313331333133313211231211111323133313232231221   >>    C111123313121111121111331333133313331321123121111132313331323223122   <<    C1111233131211111211113313331333133313211231211111323133313232231223   >>      C1111233131211111211113313331333133313211231211111323133313232231222   >>