C11112331333132311331333131333133313231333132212113313232212121   >>    C1111233133313231133133313133313331323133313221211331323221212   <<    C11112331333132311331333131333133313231333132212113313232212123   >>      C11112331333132311331333131333133313231333132212113313232212122   >>