C1111233131211111211113313331333133313232313331333133313112331212111   >>    C111123313121111121111331333133313331323231333133313331311233121211   <<    C1111233131211111211113313331333133313232313331333133313112331212113   >>      C1111233131211111211113313331333133313232313331333133313112331212112   >>