C22212323232133313113313331333132313231333132311233123311212311   >>    C2221232323213331311331333133313231323133313231123312331121231   <<    C22212323232133313113313331333132313231333132311233123311212313   >>      C22212323232133313113313331333132313231333132311233123311212312   >>