C1111233131211111211113313331333133313232313331333133311213112211232313221   >>    C111123313121111121111331333133313331323231333133313331121311221123231322   <<    C1111233131211111211113313331333133313232313331333133311213112211232313223   >>      C1111233131211111211113313331333133313232313331333133311213112211232313222   >>