C1111233131211111211113313331333133313331333133311221123232113121   >>    C111123313121111121111331333133313331333133313331122112323211312   <<    C1111233131211111211113313331333133313331333133311221123232113123   >>      C1111233131211111211113313331333133313331333133311221123232113122   >>