C11112331333132311331333133313331333112211231211111333131133131232212121   >>    C1111233133313231133133313331333133311221123121111133313113313123221212   <<    C11112331333132311331333133313331333112211231211111333131133131232212123   >>      C11112331333132311331333133313331333112211231211111333131133131232212122   >>