Rank-order rules

Among each four candidates in the candidate list order (the first four places, the second four places and so on until the end of the list) there shall be at least one candidate who is a member of the underrepresented sex. (Article 39a)

As an exception to para.2 of this Article, if the term of a councillor or MP from the underrepresented sex terminates, the successive candidate on the candidate list from among the underrepresented sex shall be elected in his place.  

If there are no more candidates of the underrepresented sex in the candidate list from which the councillor or MP was elected, the successive candidate in the order of the list shall be elected. (Article 104)