C111112111133131121133133313331333133313331323133313331333133313331333233212121   >>    C11111211113313112113313331333133313331333132313331333133313331333133323321212   <<    C111112111133131121133133313331333133313331323133313331333133313331333233212123   >>      C111112111133131121133133313331333133313331323133313331333133313331333233212122   >>