291.1. To determine the validity or invalidity of the votes, the following rules will be observed:

a) A valid vote is counted by the mark made by the voter in a single square that contains the emblem of a political party, according to the provisions of paragraph 2 of the immediately previous article;

b) Any vote cast differently than as mentioned will be counted as invalid, and

c) The votes cast in favor of unregistered candidates will be recorded separately in the minutes.