C1111233131211111211113313331333133313232321333133312113313123121   >>    C111123313121111121111331333133313331323232133313331211331312312   <<    C1111233131211111211113313331333133313232321333133312113313123123   >>      C1111233131211111211113313331333133313232321333133312113313123122   >>