C1111233131211111211113313331333133313211231211331323133313332212121   >>    C111123313121111121111331333133313331321123121133132313331333221212   <<    C1111233131211111211113313331333133313211231211331323133313332212123   >>      C1111233131211111211113313331333133313211231211331323133313332212122   >>