C1111233131211111211113313331333133313331333133311221121111133313231121   >>    C111123313121111121111331333133313331333133313331122112111113331323112   <<    C1111233131211111211113313331333133313331333133311221121111133313231123   >>      C1111233131211111211113313331333133313331333133311221121111133313231122   >>