C22212323232133313113313331333132313231333132311233123132212121   >>    C2221232323213331311331333133313231323133313231123312313221212   <<    C22212323232133313113313331333132313231333132311233123132212123   >>      C22212323232133313113313331333132313231333132311233123132212122   >>