C1111233131211111211113313331333133313331333133313331333121111331311123311   >>    C111123313121111121111331333133313331333133313331333133312111133131112331   <<    C1111233131211111211113313331333133313331333133313331333121111331311123313   >>      C1111233131211111211113313331333133313331333133313331333121111331311123312   >>