C1111233131211111211113313331333133313232321333133313331331121211111122212311   >>    C111123313121111121111331333133313331323232133313331333133112121111112221231   <<    C1111233131211111211113313331333133313232321333133313331331121211111122212313   >>      C1111233131211111211113313331333133313232321333133313331331121211111122212312   >>