C11112331312111112111133133313331333131132133313112211232212121   >>    C1111233131211111211113313331333133313113213331311221123221212   <<    C11112331312111112111133133313331333131132133313112211232212123   >>      C11112331312111112111133133313331333131132133313112211232212122   >>