C111123313331323113313331333133313331323112133313331333132323312113313311212121   >>    C11112331333132311331333133313331333132311213331333133313232331211331331121212   <<    C111123313331323113313331333133313331323112133313331333132323312113313311212123   >>      C111123313331323113313331333133313331323112133313331333132323312113313311212122   >>