C1111233131211111211113313331333133313232313331333133311212111113123211121   >>    C111123313121111121111331333133313331323231333133313331121211111312321112   <<    C1111233131211111211113313331333133313232313331333133311212111113123211123   >>      C1111233131211111211113313331333133313232313331333133311212111113123211122   >>