C1111233131211111211113313331333133313232321333133313121133133312113332121   >>    C111123313121111121111331333133313331323232133313331312113313331211333212   <<    C1111233131211111211113313331333133313232321333133313121133133312113332123   >>      C1111233131211111211113313331333133313232321333133313121133133312113332122   >>