C31231211111133131211113313231333133313231333132313331333133313232211211   >>    C3123121111113313121111331323133313331323133313231333133313331323221121   <<    C31231211111133131211113313231333133313231333132313331333133313232211213   >>      C31231211111133131211113313231333133313231333132313331333133313232211212   >>