C1111233131211111211113313331333133313232313331333133313331311311331123311   >>    C111123313121111121111331333133313331323231333133313331333131131133112331   <<    C1111233131211111211113313331333133313232313331333133313331311311331123313   >>      C1111233131211111211113313331333133313232313331333133313331311311331123312   >>