C111123313331323113313331333133313121111133112111133132233133313231121211   >>    C11112331333132311331333133313331312111113311211113313223313331323112121   <<    C111123313331323113313331333133313121111133112111133132233133313231121213   >>      C111123313331323113313331333133313121111133112111133132233133313231121212   >>