C1111233131211111211113313331333133313232313331333133313311212123311   >>    C111123313121111121111331333133313331323231333133313331331121212331   <<    C1111233131211111211113313331333133313232313331333133313311212123313   >>      C1111233131211111211113313331333133313232313331333133313311212123312   >>