C1111233131211111211113313331333133313331333133313331333133313123232211211   >>    C111123313121111121111331333133313331333133313331333133313331312323221121   <<    C1111233131211111211113313331333133313331333133313331333133313123232211213   >>      C1111233131211111211113313331333133313331333133313331333133313123232211212   >>