C1111233131211111211113313331333133313331333133313331333133313123232313221   >>    C111123313121111121111331333133313331333133313331333133313331312323231322   <<    C1111233131211111211113313331333133313331333133313331333133313123232313223   >>      C1111233131211111211113313331333133313331333133313331333133313123232313222   >>