C1111233131211111211113313331333133313331333133313331333133313123312121   >>    C111123313121111121111331333133313331333133313331333133313331312331212   <<    C1111233131211111211113313331333133313331333133313331333133313123312123   >>      C1111233131211111211113313331333133313331333133313331333133313123312122   >>