C11112331333132311331333133313331333132313311211331311332212121   >>    C1111233133313231133133313331333133313231331121133131133221212   <<    C11112331333132311331333133313331333132313311211331311332212123   >>      C11112331333132311331333133313331333132313311211331311332212122   >>