Each group of names of candidates for a particular office shall be separated from the succeeding group by a three-point rule. Each series of groups shall be headed by the caption “President of the United States,” “President and Vice President,” “State,” “United States Senator,” “United States Representative,” “State Senator,” “Member of the State Assembly,” “County,” or “City” or other proper general classification, as the case may be, printed in boldfaced gothic capital type, not smaller than 12-point. Each caption shall be separated from the names of the candidates beneath by a two-point line.