C1111233131211111211113313331333133313232321333133313331233113121   >>    C111123313121111121111331333133313331323232133313331333123311312   <<    C1111233131211111211113313331333133313232321333133313331233113123   >>      C1111233131211111211113313331333133313232321333133313331233113122   >>